How to give the user www-data permission to write to the X folder and the folders created in it in the future?

Question

SSH

Let's assume that there is a folder X with sites.
If we use chmod 777 -RX
Then we will give permissions only for existing folders and files, and if another user creates a folder there in the future, then the www-data user will not be able to write files to it.
And you will have to do chmod 777 -RX again
How to give the www-data user all rights to internal folders and files that will be created in the future by another user?

Answer 1

A common question.
https://unix.stackexchange.com/questions/12842/mak...

Answer 2

ACL