How does CFP work? It's simple: you do not pay for the poker training directly. Instead, you share some agreed percentage of your winnings with your school.
Spin & Go's guarantee a lot of action, give you a potential thrill of winning big (like MTTs), and do not chain you to a PC for hours (like cash games).
If you wish to play online poker, you can pick from many different formats. Only three formats stay popular nowadays: MTTs, cash games, and Spin & Go's.