Pilot Handbook for FPV racing drones
The best resource on how to get started is this website:
If you are a more visual learner then Joshua Bardwell on youtube is a godsend for FPV beginners:
https://www.youtube.com/watch?v=SpuXqNakP2A&list=PLwoDb7WF6c8lCKhQOTy-Vb9LfW0VAIrTP