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As a non-privileged user (your current userid is assumed):
$ groups to see just the list of group names that you belong to.
$ id to see uid, gid and all supplemental group names, with associated gid's, that you belong to.
As a privileged user (to see details of other user accounts):
$ sudo groups USERID
$ sudo id USERID
$ sudo usermod -aG GROUP1[,GROUP2]... USERID to append additional, supplemental groups to the userid. The -a is used to append groups; without it you will replace the existing supplemental list of groups.
