Here is another good source of free and paid 3D assets including textures, models, HDR images and brushes.
![](https://purdy.gatech.edu/wp-content/uploads/2021/01/poliigon_blog_post.png)
Course and general info (tutorials, notes, etc) by Prof. Purdy in the School of Industrial Design, Georgia Tech
The best websites to get free textures for your 3D artwork, plus a free 3D textures starter pack.