Growth
Increasing or improving stats, substats, skills, abilities, powers, lores, languages, or other scores usually requires in-game intention. One does not just inexplicably gain experience points and levels with no explanation as the PCs slaughter enemies. Instead, if your character wants to get better at fighting, the character has to spend time in game training. If they want to get better at a skill or lore, they must study and train. Or they need to find some magical means to improve. The only exception to this is Token use (see below).
Stats and Substats
Skills
Abilities
Powers
Other
Tokens
Sometimes a player might save up a lot of tokens and spend them for a permanent score increase somewhere. If they do this, it is considered a narrative token use to retroactively indicate their character spent time improving the score via training, study, research, or some other means that the player and/or GM must describe in game.