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Add a User to a Group (or Second Group) on Linux

User accounts can be assigned to one or more groups on Linux. You can configure file permissions and other privileges by ...
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How To Add, Delete, And Grant Sudo Privileges To Users In RHEL, AlmaLinux And Rocky Linux

Learn how to add, delete, and grant sudo privileges to users in Red Hat Enterprise Linux (RHEL), AlmaLinux and Rocky Linux.
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How to Check User Groups in Linux

You can check user groups in Linux with commands like groups, id, getent, and /etc/group to manage permissions easily.

Need to modify user accounts in Linux? This is the command for you

Many Linux commands can do more than you might think. The usermod command is one such command, and it can be very handy.