I have been a Second Life resident since 2008. The first thing one needs to know is that it is an environment, not a game. Games of various types may be found within the metaverse, but in and of itself, it is not a game.
The things you can do within SL are limited only by your imagination and technologies available at the time. It is an amazing, magic place - my personal Hotel California. Remember, though, that the people you meet, while avatars on the surface, are all humans underneath. Be smart. Be mindful. Be compassionate.