Erm i see some tabs with 0 what does that mean? sorry if this is nooby
just hit the string open, with nothing fretted. meh, doesn't matter, i wen around the place asking people what it meant too. i even asked what hammer-ons are, so you're ok
0 simply means that you hit the string open without fretting any notes.
You haven't been playing very long have you gangsta1033? lol
good luck and happy playing...