Game concept
Trait Path
From the game's encyclopedia
Some Traits offer several paths, each of which will change the Trait in different ways.
Earning Trait Experience is required to move further down a path.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Trait Path is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Some Traits offer several paths, each of which will change the Trait in different ways." It is part of Trait. It covers Trait Experience. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.