> For the complete documentation index, see [llms.txt](https://blog.syselement.com/tcm/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://blog.syselement.com/tcm/courses/linux-101/4-users-groups.md).

# 4. Users and Groups

### Topics

* Using groups and users
* Manage user credentials and permissions
* Learn symbolic and octal change permissions mode

### Sections

1. [Working with Users and Groups](/tcm/courses/linux-101/4-users-groups/users-groups.md)
2. [File and Directory Permissions](/tcm/courses/linux-101/4-users-groups/permissions.md)
3. [Changing Users and Passwords](/tcm/courses/linux-101/4-users-groups/users-credentials.md)