Ratchet & Clank: Size Matters

Skill points are specific actions you need to perform in the game. Sometimes battle related like not taking damage or getting a good time on a skyboard race. There are 2 missable skill points in the sense that you only have 1 shot at them per playthrough and you can attempt again in challenge mode for example. Completed skill points can be tracked ingame through the Special menu then Skill Points.

Missable skill points:
Friends Don't Hurt Friends - Dreamtime
Elite Annihilation - Planet Quodrona

There are already good guides for skill points i will link the one i used.
https://ratchetandclank.fandom.com/wiki/Size_Matters_skill_p...