If there are no tools[4] in the player's inventory:

"You can use your pickaxe to dig through dirt, and your axe to chop down trees. Just place your cursor over the tile and click!"
"If you want to survive, you will need to create weapons and shelter. Start by chopping down trees and gathering wood."
"Press Esc to access your crafting menu. When you have enough wood, create a workbench. This will allow you to create more complicated things, as long as you are standing close to it."
"You can build a shelter by placing wood or other blocks in the world. Don't forget to create and place walls."
"Once you have a wooden sword, you might try to gather some gel from the slimes. Combine wood and gel to make a torch!"
"To interact with backgrounds, use a hammer!"
If there are no tools[4], no ore[5], and no bars[6] in the player's inventory:

"You should do some mining to find metal ore. You can craft very useful things with it."
If there are no tools[4], at least one ore[5], and no bars[6] in the player's inventory:

"Now that you have some ore, you will need to turn it into a bar in order to make items with it. This requires a furnace!"
"You can create a furnace out of torches, wood, and stone. Make sure you are standing near a work bench."
If there are no tools[4] and at least one bar[6] in the player's inventory:

"You will need an anvil to make most things out of metal bars."
"Anvils can be crafted out of iron or lead, or purchased from a merchant."
Desktop version At all times:

"When the moon goes red, the water becomes like blood. Creatures submerged within may become grotesque and malicious."
If the player has no more than 100 maximum health:

"Underground are crystal hearts which can be used to increase your max life. You can smash them with a pickaxe."
If the player has Desktop version no more than 20 / Console Version Old-gen console version Mobile version 3DS version 0 maximum mana:

"If you gather 3 fallen stars, they can be combined to create an item that will increase your magic capacity."
If the player has Desktop version no more than 20 / Console Version Old-gen console version Mobile version 3DS version 0 maximum mana and no Fallen Stars in their inventory:

"Stars fall all over the world at night. They can be used for all sorts of useful things. If you see one, be sure to grab it because they disappear after sunrise."
Desktop version If the Tavernkeep is present:

"Normally I'd try to teach you all about the Old One's Army, but you should probably ask <name of Tavernkeep> about that."
If neither Merchant nor Nurse are present:

"There are many different ways you can attract people to move in to our town. They will of course need a home to live in."
"In order for a room to be considered a home, it needs to have a door, a chair, a table, and a light source. Make sure the house has walls as well."
"Two people will not live in the same home. Also, if their home is destroyed, they will look for a new place to live."
"You can use the housing interface to assign and view housing. Open your inventory and click the house icon."
If the Merchant is not present:

"If you want a merchant to move in, you will need to gather plenty of money. 50 silver coins should do the trick!"
If the Nurse is not present:

"For a nurse to move in, you might want to increase your maximum life."
If the Arms Dealer is not present:

"If you had a gun, I bet an arms dealer might show up to sell you some ammo!"
If the Dryad is not present:

"You should prove yourself by defeating a strong monster. That will get the attention of a dryad."
If the Mechanic is not present and Skeletron has been defeated:

"Make sure to explore the dungeon thoroughly. There may be prisoners held deep within."
If the Clothier is not present and Skeletron has been defeated:

"Perhaps the old man by the dungeon would like to join us now that his curse has been lifted."
If the Demolitionist is not present:

"Hang on to any bombs you might find. A demolitionist may want to have a look at them."
If the Goblin Tinkerer is not present and the Eater of Worlds/Brain of Cthulhu has been defeated:

"Are goblins really so different from us that we couldn't live together peacefully?"
Desktop version If the Witch Doctor is not present and the Eater of Worlds/Brain of Cthulhu has been defeated:

"I hear a race of lizardmen live in the jungle. Maybe you can get the attention of one by felling a giant beast of the jungle?"
Desktop version If the Stylist is not present:

"I once met a stylist in this region. She went off adventuring underground and that was the last I saw of her. Wonder what became of her?"
Desktop version If the Angler is not present:

"Ever caught a strange fish and you aren't sure what to do with it? I hear a fishing master lives near the ocean who might have a use for those..."
Desktop version If the Dye Trader is not present:

"There are some special plants and other ingredients that can be used to dye things. Maybe if you keep some with you, you'll find someone to show you how."
Desktop version If the Golfer is not present:

"They say sand is terrible for golfing. No self-respecting golfer would ever be caught in a desert...right?"
Desktop version If the Painter is not present and at least 5 town NPCs are present:

"Artists like to practice their craft, and painters like to paint. If enough people move in, we'll have enough homes that a painter might show up to spruce up the place!"
Desktop version If the Party Girl is not present and at least 11 town NPCs are present:

"A lot of people have moved in lately, haven't they? If it gets much more busy around here, a party girl will surely move in!"
Desktop version If the Tavernkeep is not present and the Eater of Worlds/Brain of Cthulhu has been defeated:

"Always keep an eye out for strangers in need! You never know when you might meet someone new who is in need of help."
Desktop version If the Traveling Merchant is not present and the Merchant is present:

"If <name of Merchant>'s wares don't interest you, a wandering merchant often visits with exotic merchandise you might prefer."
Desktop version If the Skeleton Merchant is not present and the world is in pre-Hardmode:

"Not all of the undead monsters are hostile. I hear one even sells merchandise deep underground."
Desktop version If the Zoologist is not present and the world is in pre-Hardmode:

"This world is full of many exciting and dangerous creatures to discover. There are some experts who might reward you for sharing that knowledge with them!"
If there is at least one Lens in the player's inventory:

"If you combine lenses at a demon altar, you might be able to find a way to summon a powerful monster. You will want to wait until night before using it, though." (only in Corrupt worlds, or in Crimson worlds on Console version Console and Mobile version Mobile)
Desktop version "If you combine lenses at a crimson altar, you might be able to find a way to summon a powerful monster. You will want to wait until night before using it, though." (only in Crimson worlds on Desktop version Desktop)
If there is at least one Rotten Chunk, Worm Food, or Vertebra (or, on Desktop version Desktop, Bloody Spine, Vile Powder, or Vicious Powder) in the player's inventory:

"You can create worm bait with rotten chunks and vile powder. Make sure you are in a corrupt area before using it." (only in Corrupt worlds)
"You can create a bloody spine with vertebrae. Make sure you are in a crimson area before using it." (only in Crimson worlds)
If there is at least one Lens, Rotten Chunk, Worm Food, or Vertebra (or, on Desktop version Desktop, Bloody Spine, Vile Powder, or Vicious Powder) in the player's inventory:

"Demonic altars can usually be found in the corruption. You will need to be near them to craft some items." (only in Corrupt worlds)
"Crimson altars can usually be found in the crimson. You will need to be near them to craft some items." (only in Crimson worlds)

If there is no Grappling Hook[7] in the player's inventory (and, on Desktop version Desktop, the player's hook slot in their equipment menu is empty), the world is in pre-Hardmode, and neither the Eater of Worlds/Brain of Cthulhu nor Skeletron has been defeated:

"You can make a grappling hook from a hook and 3 chains. Skeletons found deep underground usually carry hooks, and chains can be made from iron bars or lead bars."
Desktop version If the player has at least 140 maximum health and the world is in pre-Hardmode:

"If you thought rainy days were a drag, wait till you see it raining slime!"
Desktop version If the Goblin Army has not been defeated, the player has at least 200 maximum health, and at least one Shadow Orb/Crimson Heart has been destroyed:

"Ever seen the Goblin Scouts in the outer regions of the world? I wonder if an invasion is imminent..."
Desktop version If the Eye of Cthulhu, Eater of Worlds/Brain of Cthulhu, or Skeletron has been defeated:

"Have you ever seen beautiful lanterns floating across the night sky? The people of this world celebrate your victories, wishing you good fortune."
Desktop version If the world is in pre-Hardmode:

"If you place an empty bottle on a table, you can use it to craft all sorts of neat potions!"
"Hang up any banners you earn from defeating foes, as they will help you in future combat with that creature."
"It's pretty cold in the snow biome, but there are some unique treasures there as well. I'd check it out!"
"There are antlion tunnels deep beneath the desert, full of rare fossils and many hazards!"
"If you find a marble biome, be careful! They say that those locations are inhabited by some very dangerous creatures!"
"In granite biomes, the very stone itself is a threat, frequently coming to life and attacking intruders!"
"While you explore the underground, you may occasionally encounter helpful fairies. If you follow them, maybe they will lead you to treasure!"
Desktop version If there is any ore[5] and/or bars[6] in the player's inventory, and the world is in pre-Hardmode:

"Need to craft something with ores you can't find on <name of world>? Try fishing for crates, or placing silt and slush into the Extractinator!"
Desktop version If the player has not completed any quests for the Angler:

"If you ever need a break from all this adventuring, there's always time for some good old fashioned fishing."
If neither the Eye of Cthulhu nor the Eater of Worlds/Brain of Cthulhu has been defeated:

"If you see a pot, be sure to smash it open. They contain all sorts of useful supplies."
"There is treasure hidden all over the world. Some amazing things can be found deep underground!"
If the Eater of Worlds/Brain of Cthulhu has not been defeated:

"Smashing a shadow orb will sometimes cause a meteor to fall out of the sky. Shadow orbs can usually be found in the chasms around corrupt areas." (only in Corrupt worlds)
"Smashing a crimson heart will sometimes cause a meteor to fall out of the sky. Crimson hearts can usually be found in the chasms around crimtane areas." (only in Crimson worlds)
If the Eye of Cthulhu has not been defeated and the player has less than 200 maximum health:

"You should focus on gathering more life crystals to increase your maximum life."
If the Eye of Cthulhu has not been defeated and the player has at most 10 defense:

"Your current equipment simply won't do. You need to make better armor."
If the Eye of Cthulhu has not been defeated and the player has at least 200 maximum health and more than 10 defense:

"I think you are ready for your first major battle. Gather some lenses from the eyeballs at night and take them to a demon altar." (only in Corrupt worlds, or in Crimson worlds on Console version Console and Mobile version Mobile)
Desktop version "I think you are ready for your first major battle. Gather some lenses from the eyeballs at night and take them to a crimson altar." (only in Crimson worlds on Desktop version Desktop)
If the Eye of Cthulhu has been defeated, the Eater of Worlds/Brain of Cthulhu has not been defeated, and the player has less than 300 health:

"You will want to increase your life before facing your next challenge. Fifteen hearts should be enough."
If the Eye of Cthulhu has been defeated, the Eater of Worlds/Brain of Cthulhu has not been defeated, and the player at least 300 health:

"The ebonstone in the corruption can be purified using some powder from a dryad, or it can be destroyed with explosives." (only in Corrupt worlds, or in Crimson worlds on Console version Console and Mobile version Mobile)
"Your next step should be to explore the corrupt chasms. Destroy any shadow orb you find." (only in Corrupt worlds, or in Crimson worlds on Console version Console and Mobile version Mobile)
Desktop version "Your next step should be to explore the caverns of the Crimson. Find and destroy any Crimson Hearts that you come across." (only in Crimson worlds on Desktop version Desktop)
Desktop version "The Crimstone in the Crimson can be purified using some powder from a Dryad, or it can be destroyed with explosives." (only in Crimson worlds on Desktop version Desktop)
If the Eye of Cthulhu and the Eater of Worlds/Brain of Cthulhu have been defeated, but Skeletron has not been defeated:

"There is an old dungeon not far from here. Now would be a good time to go check it out."
If the Eye of Cthulhu, the Eater of Worlds/Brain of Cthulhu, and Skeletron have been defeated, the world is in pre-Hardmode, and the player has less than 400 maximum health:

"You should make an attempt to max out your available life. Try to gather twenty hearts."
If the Eye of Cthulhu, the Eater of Worlds/Brain of Cthulhu, and Skeletron have been defeated, the world is in pre-Hardmode, and the player has at least 400 maximum health:

"There are many treasures to be discovered in the jungle, if you are willing to dig deep enough."
"The underworld is made of a material called hellstone. It's perfect for making weapons and armor."
"When you are ready to challenge the keeper of the underworld, you will have to make a living sacrifice. Everything you need for it can be found in the underworld."
Desktop version If the Eater of Worlds/Brain of Cthulhu has been defeated and the world is in pre-Hardmode:

"Try to gather some obsidian, formed when water and lava meet. It can be used to protect against intense heat."
Desktop version If the Eater of Worlds/Brain of Cthulhu has been defeated, Queen Bee has not been defeated, and the player at least 300 health:

"Some say there are giant bee hives buried underground in the jungle. I could do with some honey myself."
Desktop version If there is at least one Desert Fossil in the player's inventory:

"You found some old fossils in the desert? I wonder if there is a way to extract them from the rock."
Desktop version If there is at least one Hellstone in the player's inventory and the world is in pre-Hardmode:

"It's time to upgrade that old Furnace! Look for a Hellforge in the Underworld, it's the only way to craft Hellstone bars."
If the world is in Hardmode (and, on Desktop version Desktop, Plantera has not been defeated):

"Make sure to smash any demon altar you can find. Something good is bound to happen if you do!" (only in Corrupt worlds)
"Make sure to smash any crimson altar you can find. Something good is bound to happen if you do!" (only in Crimson worlds)
"Souls can sometimes be gathered from fallen creatures in places of extreme light or dark."

If the Wizard is not present and the world is in Hardmode:

"I heard there was a powerful wizard who lives in these parts. Make sure to keep an eye out for him next time you go underground."
Desktop version If the Steampunker is not present and the world is in Hardmode:

"I hear there's a woman out there well-versed in fighting back the forces you just unleashed. Maybe if you prove yourself, you can get her attention."
Desktop version If the Cyborg is not present and all three Mechanical bosses have been defeated:

"Machines aren't so bad. Maybe we can build one of our own, if we can just get some explosive weaponry from the jungle..."
Desktop version If the Tax Collector is not present and the world is in Hardmode:

"The Tortured Soul down in the Underworld sure looks familiar...have you tried using Purification Powder on him?"
Desktop version If the Pirate is not present and the world is in Hardmode:

"There have been some pirates sighted around lately. If we befriend one, you think he might show us where he buried his treasure?"
Desktop version If the Truffle is not present and the world is in Hardmode:

"I've heard of glowing mushrooms growing big enough on the surface to gain sentience. Wonder if there's any truth to that..."
Desktop version If the world is in Hardmode, the Pirate Invasion has not been defeated, and the player has at least 200 maximum health:

"I think I saw a treasure map floating around in the ocean once, but a shark ate it. Maybe you should go try and find one?"
Desktop version If the world is in Hardmode, the player has no Wings equipped and is not currently riding a mount[8], and Plantera has not been defeated:

"Have you seen the Wyverns soaring high up in the clouds? If only I could fly like that..."
Desktop version If the world is in Hardmode, at least three Altars have been destroyed[9], and no Mechanical boss has been defeated:

"Try combining a Hellforge with some adamantite ore. I bet you could make some really powerful stuff with that!" (only in Adamantite worlds)
"Try combining a Hellforge with some titanium ore. I bet you could make some really powerful stuff with that!" (only in Titanium worlds)
Desktop version If the world is in Hardmode and any Mechanical boss has been defeated:

"On rare occasions, the moon will blot out the sun, bringing out lots of scary monsters!"
Desktop version If the world is in Hardmode, any Mechanical boss has been defeated, and the player has less than 500 maximum health:

"Run into any rare fruit growing in the jungle lately? If you eat it, it will increase your max life!"
Desktop version If the world is in Hardmode, all three Mechanical bosses have been defeated, and Plantera has not been defeated:

"I've heard of glowing pink bulbs growing around the jungle recently. Be ready for anything if you decide to harvest one."
Desktop version If the world is in Hardmode, Plantera has been defeated, Golem has not been defeated, and there is at least one Temple Key in the player's inventory:

"That key you have can be used to unlock the Temple hidden in the jungle. Have you found it yet?"
Desktop version If the world is in Hardmode, Plantera has been defeated, Golem has not been defeated, and there are no Temple Keys in the player's inventory:

"They say that there is a sealed Temple, hidden away in the jungle. I wonder how you could open it?"
Desktop version If the world is in Hardmode and there is at least one Biome Key of any kind in the player's inventory:

"Wow, that key you have is pretty nifty! I heard keys like that can be used to get rare treasure in the Dungeon!"
Desktop version If the world is in Hardmode, Golem has been defeated, and Martian Madness has not been defeated:

"I saw some flashing lights, high up in the sky and far away. The truth is out there, I'm telling you."
Desktop version If the world is in Hardmode and Duke Fishron has not been defeated:

"I've heard reports of a very strange worm in the underground mushroom fields. I wonder if it would be any good as bait?"
Desktop version If the world is in Hardmode, Golem has been defeated, and neither Mourning Wood nor the Pumpking have been defeated:

"Ancient prophecies speak of a way to summon the monstrous hordes of Halloween through medallions crafted with pumpkins."
Desktop version If the world is in Hardmode, Golem has been defeated, and neither Everscream nor Santa-NK1 nor the Ice Queen have been defeated:

"Legends tell of a cursed gift that can turn the most festive of nights into an invasion of horrors!"
Desktop version If the world is in Hardmode, Golem has been defeated, the Mysterious Tablet is present, and the Moon Lord has not been defeated:

"There are some strange people in hoods loitering outside of the Dungeon. Maybe you should check it out?"
Desktop version If the world is in Hardmode, the Lunar Events are active, and the Moon Lord has not been defeated:

All quotes sourced from the official Terraria wiki.

Read this guide if you need further instruction: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2215421571