Although the book mostly contains Unity-specific details, you still can find the information which can be applied to other game engines including sections on the principles of animation and lighting, comparison tables on the pros and cons of tilemaps, sprites and sprite shapes, skeletal and frame-by-frame animation, as well as shader-, particle-, and clip-based FX.
If you're learning Unity, you can find lots of useful tips and practices in this e-book. However, for those who are completely new to the software, the authors suggest starting with the beginner tutorials and courses which you can find at Unity Learn.
2D Game Art, Animation, and Lighting for Artists is available for free and can be found on Unity's official website here.
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