Post all treasuries here - Ones you make, ones you're in, BNS/BNRs you curate or are featured in.
It's not required that you comment on the treasuries above you, but it's always appreciated.
Anyway, if you buy something from ANY of the shops on the treasury, you get to be featured too! Then, people will have the chance to buy from YOU to get a spot on the treasury, and so on. The difference between BNR and BNS is that, with a BNR you IMMEDIATELY replace the spot on the treasury that you bought from. With a BNS, you don't get featured until the next round, which is usually in a couple days to a week.
They are really easy and fun, once you get the hang of it. I hope I explained it well!