Game concept
Education Trait
The game also links it as Education Traits.
From the game's encyclopedia
Upon reaching Adulthood, every character receives an Education Trait.
There are five types of Education Traits, each of which directly corresponds a specific Skill.
The quality of the Trait a character receives will depend how well their Childhood Trait matched the Education Focus as well as the relevant Skill of their Guardian.
A characters Education Trait improves how fast they will progress in the corresponding Lifestyle.
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.
Education Trait is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Upon reaching Adulthood, every character receives an Education Trait." It is part of Trait. The game also links it as Education Traits. 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.