I talk about skill-based XP progression, where games give their players XP based on their use of skills. I discuss the problems this method can cause that you will need to either fix or dismiss as a non-issue for your game. This progression can also apply to perks, traits, backgrounds, or anything about the player build that affects the game.
Videos I reference:
How To Give Experience Points: https://www.youtube.com/watch?v=NyVZlvaAYX4
Class-based vs. Skill-based RPGs: https://www.youtube.com/watch?v=scvCVwGnT2E
Procedural vs. Handmade Content: https://www.youtube.com/watch?v=jkXd503iCRI
Learning Lessons From Failure: https://www.youtube.com/watch?v=Kh5JMp5_5nQ