CHMOD-ing
Chmoding is changing file
permissions on servers using Linux.
It is all about who you allow to do what with your files and folders.
It goes like this:

So, simply said, the most used is like 755, meaning OWNER, you, can
read file, write to file, and execute it. That's 7, the first number.
GROUP can read and execute, 4 + 1 = 5, and everybody else, OTHER,
can also read and execute it, 5.
It would not be great to accidentally give write access to everybody,
because everybody could also delete file or folder. Sometimes it is
checkboxes and sometimes you need to enter the numbers manually.
That's how it works on Linux. It's basic stuff only, there's more to
it, but it'll do.

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