For 2D art https://2dgameartguru.com/ https://2dgameartguru.com/ might be good. It started as a set of tutorials for game programmers struggling with making ar

For 2D art https://2dgameartguru.com/ https://2dgameartguru.com/ might be good. It started as a set of tutorials for game programmers struggling with making art. It specifically focuses on vector art, and pixel art might be more suitable, for that https://lospec.com/ https://lospec.com/ links to many tutorials. For game design process Game Design Workshop and Challenges for Game Designers are good books that cover process comprehensively (TLDR is quick concept, prototype, play test, refine).