This new diagram for the `useradd` command is nice but it opens up a can of worms because of what it misses:

• The `useradd` command also reads `/etc/default/useradd` which should be mentioned in the lecture actually.
• It also adds an entry to `/etc/gshadow` when you create a user.
• It creates a mailbox for the user under `/var/spool/mail`
• It updates `/etc/subuid` and `/etc/subgid` to add subordinate ranges for the new user.

Also, the lecture should mention that `userdel -r` removes both the home directory and the mailbox.