All right, let's have a look at the commands that we have seen. There's only a handful chown for change owner.
That is the first thing that you need to do to set your file or directory ownership.
And chdrp is doing the same for the group owner. So chown is for user owner chdrp for the group owner.
Chmod is changing the permission mode.
Very important command to define which permissions are set to which files.
And umask is what you can do to manipulate the default permissions.