We have 100 readers! Let's make an FAQ.

Hi everyone,

This subreddit needs an FAQ. I'll start it, but I'd like everyone's input since I'm not knowledgeable enough to definitively say what's what. So without further ado, here's my first swing, and everyone please jump in to correct and add your own stuff.

I've done one question per comment so everyone can respond to the right section. Later on this might get put into a different format.