How does the daily content get chosen?

They have an octopus in a tank which picks seemingly at random. but he knows what he is doing. they all think he is just a dumb octopus. but he'll show them, one day he'll show them all!

Sololearn admins will pick them.

I believe it's all in the hands of the administrators and moderators https://www.sololearn.com/Content-Creation-Guidelines/