OLGA shut down, the best site ever was this one where you downloaded the tab and it would play in a midi version so you could play along right with the song which is the problem with tab you have to have the song and the tab to play it right unlike normal written music.

the 6 lines correspond to each string and the number is the fret the note is played on. Whatever tuning you are in the open note of each string is the begining of each notation progression. So lets say you are in standard tuning (e,a,d,g,b,e) and the tab looks like this:

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---3-----

you would play the open note which is an e then the first fret which is an a, second fret a#, and the third fret is a b. Your note is a b. Just know what tuning you are in so you know where to start than just go through the notation progression on up the neck until you find your note.