The following commands are available in the Gnus group buffer:
Switch to the summary buffer for the group on the current line.
In the group buffer, list only the groups to which you subscribe and which contain unread articles (this is the default listing).
List all subscribed and unsubscribed groups, but not killed or zombie groups.
List killed groups.
List zombie groups.
Toggle the subscription status of the group on the current line (i.e., turn a subscribed group into an unsubscribed group, or vice versa). Invoking this on a killed or zombie group turns it into an unsubscribed group.
Kill the group on the current line. Killed groups are not recorded in the .newsrc file, and they are not shown in the l or L listings.
Move point to the previous group containing unread articles.
Move point to the next unread group.
Move point to the previous unread group.
Update your Gnus settings, and quit Gnus.