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##Fix www-data permissions

usermod -aG www-data myUser
chown -R myUser:www-data /var/www
chmod 2775 /var/www

2 → set group id

7 → rwx for owner (myUser)

7 → rwx for group (www-data)

5 → rx for world

Set group ID (SETGID) bit (2) causes the group (www-data) to be copied to all new files/folders created in that folder.

There's a -R recursive option, but that won't discriminate between files and folders, so you have to use find, like so :

find /var/www -type d -exec chmod 2775 {} +

Change all the files to 0664

find /var/www -type f -exec chmod 0664 {} +