The First Lesson

After completing "setting up camp - the war (part 2)", regardless of the outcome, both chiefs will finally give you the lessons they promised you a while back. Note: you need to wait at least until the day after finishing the camp quest, that means one day after reporting to Axel/Nauxus.

• Nauxus: He won’t call you, you need to enter his room to start. The chief will test your ability to decipher some paintings, simple enough, since Nauxus, among the countless other qualities he has, as expected from a chief, is an amazing artist, even better than the one who drew him...still, if you really need the right answers, check Caro’s post on Patreon.
  The game will choose 2 pics at random, while the 3rd one will always be the “tour we took”, so you’ll see only 3 out of the 5 pics he made (unless you reload the save file) what a shame.
  The reward is the same, always one level up point, but the scene afterwards is different, i suggest checking them both by reloading the save, the fail one is still somewhat sweet. The outcome also won’t affect your relationship with him whatsoever.
• Axel: He’ll call you the next time you enter the village. This is a long cutscene that shows a bit more of Axel’s (and the tribe’s) philosophy and character, but you’ll gain a free level up point from it.