Supplementary groups ? and group? what is the difference?
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Group is the main group and can be only one. 'Suplementary groups' is a place for all other groups (there's a limit on number of groups for one user, but it's hard to get to it) . There's not big difference.
What o you mean when you write 'point to some place'? Home directory? Beeing in a group means you can access files/directories with group equal to one of your groups (of course, the permissions may be different, for example when owner has read/write/execute, group can have read/execute and other users may have no access to the file).