Su-user explanation

Su [-FMP] [-C command] [-s shell] [-- help] [-- version] [-] [user [Arg]

-C command: the user who changed the account to user, and then executes the command to change it back to the original user.

What is the difference between the su command and the Su-command in Linux?

Su username is switched to another user, but does not switch the environment variable.

The Su-username is completely switched to a user environment.

Sudo is called restricted Su, because sudo requires authorization, so it is also called the authorized Su

The sudo command execution process is that the current user switches to the root (or another specified user), and then runs the command as root (or another specified user). After the command is executed, return directly to the current user.