How can people gain xps if they haven't played any challenges or doing any courses?

Question

i noticed some users haven't done anything in the last two days, yet still got min. 20 xps on one day.

Answer 1

Not even .. Best answers, daily login..?

Answer 2

They do!
We can now deselect the challenges as well as courses from the activity feed ...

Answer 3

I get my xp prevailingly from best answers as of recently. I no longer accept challenges, too low stakes, too high risk. Maybe if the Ruby ones kick in, maybe then.

Answer 4

codes, getting up votes on codes/comments, best answers, getting followers.
.
basically getting anything towards the other parts of the circle such as influencer and contributor