Shortcut shutdown in 2 ways - difference?

Greetings. I have been using your guide to a shutdown shortcut for some time, but now it has given me some troubbles (some programs don't shut down properly anymore for some reason). I used this in the setting: C:\Windows\System32\shutdown.exe -s -t 00 -f I then found a solution like this: C:\Windows\System32\shutdown.exe -p -f For now it is working, but what is the difference in...