WordPress Permissions – How To Set Up Proper Filesystems And Ownerships https://www.smashingmagazine.com/2014/05/proper-wordpress-filesystem-permissions-ownerships/
linux – Allow specific user permission to read/write my folder – Super User https://superuser.com/questions/235297/allow-specific-user-permission-to-read-write-my-folder
Reset home folder permissions | [Fix-KB] http://www.fixkb.com/2011/08/reset-home-folder-permissions.html