$1.$ Using systemctl, how can you suspend the machine to ram?

$2.$ What is the difference between disabling a service and stopping it$?$

$3.$ What is a unit?

$4.$ In some of the systemctl and journalctl commands, we used grep. How was this helpful?

$5.$ After running systemctl status or other commands using systemctl or journalctl, how do you get the

command prompt back if the terminal appears to lock up$?$