
There have been many questions over the years about how to make one roll or another that are answered in the wiki, but the answers might be spread among several different pages. So I wrote up an article which collects almost everything about rolls in one place - making rolls, exploding rolls, roll and keep, using macros, chat buttons, reusing rolls, and so on.
https://cybersphere.me/roll20-dice/
It does refer to the roll20 wiki (which is an amazing resource, largely due to the fantastic work of Andreas), and some things are a bit more condensed than I'd like (but the article is already long), but still, I needed this so maybe others will find it useful.