Understanding of permissions for Linux folders and files

A folder's R (readable) permission allows the user with this permission to see the directory structure within the folder, but cannot access the folder without the X (executable) permission. Therefore, to enter the folder must have X permission, W (writable) permissions can let the user arbitrarily manipulate files in the folder, such as delete, add, Rename:

The r permission of the file is to open the file browse content, W permission is can edit the file, x permission is can let the file can be executed by the system.

Understanding of permissions for Linux folders and files