Secondary skills in Heroes 3.

And the "Lore" skill is often important at the beginning of the game, as it is necessary to teach all heroes a spell, but it is not available in the castle. For example, at the beginning of the game, it is good to have a hero with the "Lightning" spell and "Lore".
Also, a hero with "Scouting" looks good at the start of the game.
As for "Learning," I don't know what it's used for.