A quick and probably stupid question.

Hello, I'm new to the forum, my name's Mark and I'm hoping for a bit of guidance.

Anyway, my question is; On some Guitar Tabs, it has the number 0 on some strings, what exactly is meant by this? Looking forward to any replies.

Thank You.

The 0 means that you play the string 'open'. That means that you don't fret anything; you don't use your left hand at all, you just pluck the string. If you, without using your hand just pluck all of the strings, the tab would be like this:
--0----
--0----
--0----
--0----
--0----
--0----

Thanks, some of this guitar tab malarky is starting to make sense :P