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Troubleshooting
If the Community Server Browser window glitches out and either doesn't add the server to favorites or doesn't let you connect, just close it or restart the game. It should work fine the next time.
If you connect, see the loading screen and then the game just shoves you back to the default welcome screen, it means that either your client or the server are running a different version of the game. Make sure your client is up-to-date or wait for the server to update itself (usually happens overnight).
If the game says something like "your map GGG.bsp differs from the servers", it means that we have updated the map and you have an older version of it on your system. To fix this, go to your game folder and delete the GGG.bsp file. The path looks like this: C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\maps