https://www.youtube.com/watch?v=GLSG_Wh_YWc
Stateless vs Stateful
https://youtu.be/GLSG_Wh_YWc?t=8840
https://youtu.be/GpLb2XvKv20?t=946
https://medium.com/@matthew.smith_66715/why-we-chose-flutter-and-how-its-changed-our-company-for-the-better-271ddd25da60
State
https://www.jianshu.com/p/ed9c3378e9cc
https://tw.saowen.com/a/cff1432eff1eb306314bd241f231b4d693eaaa5aaa5310df9015fc7a0e53c134