if you were reading a tips and tricks page about alias' and you are figuring that when people use the ll command that it does the same as ls -l without doing anything well then thats where you got tricked
you have to make an alias for "ll" if you want to use it as a command as it doesn't pre-exist...
so you could edit your .bashrc file in your home directory and type:
alias ll='ls -l'
and then when you type ll you will see the same output as ls -l.