Here you will get some infos concerning the use and configuration of the Gnus Group buffer. You should find keybindings to easily access some gnus functions and also find some way to configure the groups.
- G DEL => will delete the group under the point - C-u G DEL => This is "deleted" as in "removed forever from the face of the Earth". - G r => rename the group under the point - g => fetch new news - M-g => only fetch new news for the group under the point
… others to come
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For other information you can go to GroupParameters page.