I'm going to use a lot of Bored Gamer's vids, there are other good SC vloggers but he talks about everything, warts and all, which I like.
He's going to be doing a monthly status report, the first of which is below.
You will hear him refer to Arena Commander and Star Marine, so I'll explain.
In addition to Star Citizen (multiplayer universe), and Squadron 42 (single player game, not released yet) there are two other extras that we currently have access to.
Arena Commander
This is a mode to practice flying and combat. It's actually the very first proper playable game they ever introduced and it's where I learned to fly. You can fly solo, have combat against AI, and race against humans and AI. It also has the tutorial.
Star Marine
This is essentially a first person shooter but outside of your ship. It's basically COD in space.