Well well well, look what the shoggoth dragged in.

GM Advice

1d12 + 1d8 Random Tables

The 1d12 + 1d8 table is commonly used for random encounters, because it gives a nonuniform distribution where some outcomes are more likely than others. But why stick to that? By rolling one of the dice with advantage or disadvantage, you get a very different distribution, and can make one table work in many situations.

I Roll in the Open

A lot of GMs advise rolling behind a screen, so you can fudge rolls when you get a result which would be bad for the story. I think that at best fudging is unnecessary, and can be remedied by being more thoughtful about what rolls you ask for (and I go in to how I think about rolls), and at worst cheating, where you’re explicitly ignoring the rules of the game.