#1
i hope this it the right place for this, anyways.....

when a tab has a chord, then it has the same chord but it says its a ghost note how you play it
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#2
Andrew created an excellent FAQ at the top, people should check it out before posting questions.

(8) - Ghost note. Basically it's an optional note. It may be that the note should be there in a run of notes and was accidently missed out in the recording or it may be that it is the natural note to go to in a sequence. Else, it may be played very quietly or on a different instrument and the tabber is giving you the option to play it.