chmod 700 — what rwx------ means
700
rwx------
The owner can read, write, and execute; the group and others get nothing at all.
Permission breakdown
When to use 700
Private directories and personal scripts that only your own user should touch. A good default for a home-directory subfolder or a script holding logic you don't want other accounts to run.
Set it with chmod
Apply this permission to a file:
chmod 700 filename
Or apply it recursively to a directory and everything inside it:
chmod -R 700 directory/
Other common permissions
Or build any permission with the interactive chmod calculator.