This post is about my practices with Unity 2D, and this post will only contain the result I concluded.
Not all of those conclusions are mine, I just do search, read, watch, practices, collect, etc..
You can find some key points and references at the this topic’s footer for further learning.
Q & A Index
- Where is the official Unity 2D tutorial?
- Should I use UI Components or Sprite as Unity 2D Character?
- Could I attach rigidbody to UI element?
- The right way to flip (mirror flip) sprite?