How do units get xp points?

[resieg]

Does anybody know in detail, how units get xp points?

Most what I watched was 6p for killing.
Some attacks (ranged) even got nothing (zero).

How is this calculated?

[MrNo]

There's a bunch of rules surrounding it, outlined here:

https://age-of-wonders-3.fandom.com/wiki/Unit_Experience#Exp_Values

[Iguana-on-a-stick]

In very short:

Every action you take gives you XP (except free actions like activating war cry, etc)
This includes attacking, defending, healing, buffing, casting (combat) spells, and getting kills.

However, there are various "caps" in place on how much XP you can get, to try and limit exploits. (I.e. people would trap a regenerating unit in a net and then attack it without killing it, let it heal, attack it again, etc.)

Notably you can at most get 1 level/medal per combat.

Linked post has tons more details.