Steam has most PC games, but it doesn't have them all. You'll need to know how to add external games to your Steam library to have your collection in one spot.

To add friends on Steam, you can enter their Friend Code, click a link, or go to their profile. Most of this can be done from just one menu.

You can find your Steam ID from the profile tab of the Steam application by locating its URL. Your Steam ID is a 17-digit number unique to you, which you can use to link other people to your ...