If you belong to a lot of groups, you can access your most frequently used groups using Favorites. To add a group to your Favorites, just click the group’s star icon.
Note: If you click Starred in the left navigation area, you see starred topics and posts (but not groups). Starred groups are found under Favorites.
All the groups that you belong to are listed on your personal My groups page. If you manage or own a group, that’s indicated next to the name of the group.
Do you get too much email for a particular group? You can opt to get a summary of messages sent to a group once a day instead of receiving each message separately. Or, perhaps you'd prefer to just read messages in the group's discussion archive (forum page) instead of receiving messages in your inbox.
Change your email preferences or unsubscribe from a group:
Go to your My groups page.
Select an email subscription option.
Click Leave this group to unsubscribe.
Other Settings
There are a lot of setting options in Group, please take a look at them for more finely tuning your Group. Some important settings are
Settings -> Tags : Enable or disable tag feature.
Settings -> Categories : Enable or disable categories feature.
Settings -> Email options : Setting group's signature, subject prefix and more.
Permissions : Several activities permission in the group, they were set for almost public by default (everyone can do almost anything).