Quite a good summary overview, in the linked article below, which is easy to follow. As the saying goes for Linux "Everything in Linux is a file", so understanding file permissions is quite important. Also, if you do any web hosting or similar server based applications, it is often incorrect file permissions that create errors (usually just needing file ownership or permissions corrected to solve them).
I can probably add, too, that you can also change file permissions and ownership across all files and sub-directories within a folder, with the addition of the -R option. Although there are many flavours of Linux distros out there, these basics remain the same across all of them.
See
Understanding The Linux File Permissions | LinuxHostSupport#
technology #
linux #
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permissions 
In this tutorial we are going to explain the Linux file permissions in different Linux distributions such as Ubuntu, CentOS, Debian, and AlmaLinux. The Linux file permissions are very important to understand and use properly, due to security reasons and user access rights. The user access rights are controlled by the permissions, attributes, and ownership.
