I propose we make a series of exercises to go along with the articles of the sequences. These exercises could help readers know how well they understood the material as well as help them internalize it better.
Now that this is happening, I suggest a post (maybe discussion, maybe main) noting that it is happening and with progress and commitments so far.
It seems we have agreed that open threads will continue but that they will go in the Discussion section, so here's this month's thread.