Can you add here in FAQ how to send tips? I see posts that says "4 sats \ 20 tipped \ 1 comments" So I understand that 4 sats comes from people clicking on "boost" icon and goes to OP wallet, but the tips from where are coming?

Sure. But to also explain it here: after you upvote, every following upvote is a tip.

ahhh ok now I get it. So only the first click on boost is like upvote, after that if are from the same user, are tips. Nice.