Set Read, Write, and Execute permissions for Owner, Group, and Public on a visual matrix. Prevent security vulnerabilities caused by incorrect permissions.
In Linux systems, every file and directory has a 3-level permission structure: **Owner**, **Group**, and **Public**. Chmod (Change Mode) is the command used to manage these permissions.
Linux permissions are math. **Read = 4**, **Write = 2**, **Execute = 1**. For example, to grant both read and write permissions, you calculate 4+2=**6**.
For security, WordPress folders should generally be **755**, and files should be **644**. Sensitive files like `wp-config.php` should have stricter permissions like **400** or **440**.
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