Roadmap

Hello! I would like to learn all about resource pack design. Mainly to improve creating my own 💪🏻, but also to understand some more complex ones from other people, such as:
-Custom 3D Entities (With nametags or random spawn)
-Animations for entities (Custom Boats for example or the shield_blocking)
-3D Models for items
-Item Physics (On ground)
-Block Models (With variations, like inverted stairs with a different design)
-Combining packs and understanding them thoroughly.
Could you recommend a roadmap, playlist, or bibliography to learn about this? I would greatly appreciate it. Thank you!