It may be hard to find good-quality textures and models you want for your blender projects;
And those simple, low-quality textures and models you found on google might not cut it.
I went to go do some looking and I have found a few websites great for getting textures and models.

https://www.textures.com/ [Some are free, but you will need to login to download them This site includes textures and models.]

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https://hdrihaven.com/ [Now named Poly haven at https://polyhaven.com/ . It includes HDRIs, textures and models. You can donate to help keep their site up on their Patreon.]

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https://texturehaven.com/ [Now named Poly haven at https://polyhaven.com/ . It includes HDRIs, textures and models. You can donate to help keep their site up on their Patreon.]

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https://3dtextures.me/ [Free, but there are a lot of ads everywhere. You can donate on their Patreon to help keep the site up.]

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https://freepbr.com/ [Free textures. You can pay to use all of them commercially.]

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https://www.poliigon.com/ [Having some free, it includes HDRIs, textures, brushes and models.]

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Thanks stiky! https://www.cc0textures.com [Renamed to AmbientCG, it has multiple resolutions including 8K, with normals and ambient maps. The site also has some models, some editable Substance Designer files and brushes. It also has a few 3d Models. They are all free. You can also donate to help the to keep running the site .]

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Thanks Volmancer! https://github.com/eliemichel/LilySurfaceScraper [Add a link and the addon automatically adds the texture.]

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Thanks bangermsuk! http://texturelib.com/ [Packed full of images for reference and textures, all free.]

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Thanks Spirit and ElDiabloFR! https://quixel.com/megascans/home/ [Includes megascans, Brushes and I think textures. It uses a credit system, and if you log into the site with an Epic Games account, you get infinite credits.]

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https://www.sketchuptextureclub.com/ [Includes textures and models, some are free while some are limited to a "Club Member" so they can keep their site running. The cost for Club Member is £11.20 a year (€13 or $14.50)]

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https://3djungle.net/ [Includes free textures and models, although they need an account to download; which are free to make. This is one of my favourites. The site does have a download limit: 5 for models, 10 for textures. It resets every day.]

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https://www.blenderkit.com/ [Includes some free textures, models, hdrs, brushes and add-ons. You can use their blender add-on to easily download and use anything from their website. One of my favourites.]

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https://www.sharetextures.com/ [Alot of textures that have most maps needed. Includes free textures, but some are limited to their Patreon, which you can donate to and help them keep the site running and make more textures. A great site in my opinion.]

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https://blendermarket.com/ [I'm not surprised if you know this, but it contains a lot of textures, models, hdrs, brushes, add-ons and most things really. A lot of stuff does cost you, although some things are free.]

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https://www.texturecan.com/ [All textures are royalty free, but you will have to disable any Ad Blockers as they need the revenue from ads to keep the site up.]

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https://polyhaven.com/ [Full of free models, textures and HDRIs. One of the best sites personal, and a favourite of mine; and everything has a CC0 license so you can use them for whatever, commercially or not.]

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Thanks Råb!d! https://kitbash3D.com [Very expensive, going up to £100 or even £200 in some cases; but you pay for model kits containing a large amount of very very high quality models and textures. I recommend this for studios or people that have money to spend on things like this. I don't recommend buying this if you don't have a lot of money to spend on things like this.]

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Thanks again Råbid! https://substance3d.adobe.com/plugins/substance-in-blender/ [A free Blender addon that allows you to access Adobe Substance textures, along with other things. There are dozens of free really nice, high quality textures. Make sure to read the instructions before attempting to install. This is worth checking!]

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A big thanks to Råbid! https://www.printables.com [A site containing a large collection of community made 3D Prints. While most models weren't exactly made for Blender, they can still be used - just make your own materials and textures for them!]

If there are any more websites that should be put on the list just comment, I'll add them on.