The only "mod" you need is a texture pack:
https://www.nexusmods.com/witcher3/mods/9963
I suggest not using mods. Enjoy the game as intended by developers.

I don't get what's with some peoples' obsession with modding.
Game is great without any.

You dont need any, but if you want some improvements download:
1) Component Quantity Gain on Dismantle Screen - before you dismantle an item you see how many parts you'll get
2) Eating Can Wait - you simple can't abuse eating during a fight but can drink witcher potions, so bigger focus on alchemy
3) Blood Trails - purely cosmetic
4) Glowing Witcher Eyes - purely cosmetic
5) Larger White Orchard - cosmetic. It makes an illusion of the location being part of a larger land mass

They are steam workshop mods so all you need to do is subscribe

Quests.
https://www.nexusmods.com/games/witcher3/mods?categoryName=Quests+and+Adventures&timeRange=allTime&sort=endorsements

ignore the bozos who say you don't need mods when they can make the experience enhanced theres some amazing ones like

Cloaks for geralt
Full quest exp so lower quest dont give 1 exp
Realistic weather
better hairstyles and beards
Gwent overhauls though id recommend this if you want more challenge
better trophies
better minimap
brother in arms which fix over 5000 bugs
fast travel from anywhere
no fall damage
improved saddlebags to hold more loot

and theres many more thats just to name a few and yes you can have an amazing experience without mods but theres some that make it alot more enjoyable and theres nothing wrong with it

for the sake of humanity please do not use mods

Do NOT use Fast Travel from Anywhere, it can easily softlock your run if you use it when FT is supposed to be disabled.

That way, you wouldn’t trigger scripts that the game expects you to trigger and quest progress can stall.

And beyond that, if you FT everywhere, you will(!) miss a ton of random events and encounters that are never marked on the map until you trigger them by drawing close.

Originally posted by Homer Morisson:

Do NOT use Fast Travel from Anywhere, it can easily softlock your run if you use it when FT is supposed to be disabled.

That way, you wouldn’t trigger scripts that the game expects you to trigger and quest progress can stall.

And beyond that, if you FT everywhere, you will(!) miss a ton of random events and encounters that are never marked on the map until you trigger them by drawing close.

Thank you, yes I saw this info before at redit i won't use it.

https://www.nexusmods.com/witcher3/mods/9384

First Person mod. This game should have been first person from the start.