While Google+ has a slick design and Google clearly tries to make the platform as intuitive as possible, your first few days with the new social network can be overwhelming.
You may expect to log in and immediately see all your friends' activity with no effort at all. Or perhaps you're looking for a Facebook clone in every sense. You'll find neither on Google+.
The "Welcome" screen helps. When you start up Google+ you're told that the project "makes sharing on the web feel like sharing in real life." You see Circles, Hangouts and Sparks as three important areas.