Lättlärd & Svårlärd are from Eon4, and seem to have been replaced with "Talang" (Talent) & "Inkompetens" (Incompenc[e/y]) in Eon5.
Lättlärd means that:
* You lower the cost at character creation from 2D6 to 3D6 to zero "units", effectively making you start with 3D6 in skills with a dot next to them.
And for those skills that don't normally start at 2D6, you get 3D6 as soon as you "buy" them to 2D6 with 1 "unit".
* During game it lowers the difficulty to raise the skill by 2.
* Cancels out "Svårlärd" on the same skill.
Svårlärd means that:
* Increases the "unit"-cost by x3 during character creation.
* Difficulty to raise skill during game is increased by 4.
* Cancels out "Lättlärd" on the same skill.
Talang/Talent means you get an extra +1T6/+1D6 when using focus on said skill, ie. +2/3D6 for 1/3 focus as an example.
Incompetens/Incompetence means that:
* At character creation, a maximum of 1 "unit" may be spent on that skill (translating into 2D6 as skill value).
* The skill can't be raised above 2D6 during game.
* You can use focus on the skill as normal though.