Game concept
Education Focus
The game also links it as Education, Educations, Educate, Educated, Focus.
From the game's encyclopedia
All Children between age 6 and 9 can be given an Education Focus geared towards one of the five Skills.
The Education ends with an Education Trait upon reaching Adulthood.
The quality of the Education Trait they receive will depend on how well their Childhood Trait matched their Education Focus as well as the relevant Skill of their Guardian.
When setting the Education Focus, you can also specify whether or not the child should be raised in the Guardian's Faith and/or Culture.
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 Focus is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "All Children between age 6 and 9 can be given an Education Focus geared towards one of the five Skills." The game also links it as Education, Educations, Educate, Educated and 1 more. 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.