Why React Curriculum is incomplete?

Why react curriculum on freecodecamp doesnot includes functional components and hooks?

The react course was written over 3 years ago when hooks were still new.
At the time, classes were still widely used.

Front end libraries change all of the time.
The curriculum hasn’t been update yet.

But freeCodeCamp has some really good video on youtube going over hooks

But I like interactive way of learning by coding.