A free mod for Mount & Blade II: Bannerlord, by Igmat.

This mod aims to add more sense to attributes (Vigor, Control, Endurance, Cunning, Social, Intelligence), so they affect more parts of gameplay than just learning rate and limits of respective skills.

In this way, the game does not become too trivial, but it also allows you to gain more insight into the game mechanics.

The main difference from the other mods is that this one does not only increase the learning rate of the characters but also adds additional bonuses for each attribute.

As you can see from the screenshot, the learning rate for each skill is now increased by a fixed amount, depending on the level of the character.

And, as expected, the attributes also affect the game dynamics.