The following command signs me out (do not run this command):
kill -9 -1
I don't understand why.
Can someone explain this to me?
The syntax is kill SIGNAL PID.
The -9 option specifies that the SIGKILL signal should be sent (immediately terminate the target process(es), and specifying the PID -1 is shorthand for "all processes except itself and init".
Since you don't use sudo (and presumably don't have root permissions), this immediately kills all processes you have permission to kill - your entire session, hence logging you out.
