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8 slide 0...why is 0 in parentheses?
7 slide 9...what does curve under mean?
5 7 5..7 5 0..are they hammers or pull offs..how you distinguish those
how to play this?
what does this long line mean?
15 slide 17 with curve and 17 slide 19 with no curve...what is difference?
I'll answer each of your questions in order:
The notes in parentheses are ghost notes. You should play them quietly - certainly don't emphasize them. They do have rhythmic value, however (i.e. they aren't grace notes).
The 7 to 9 slide is a legato slide. Pick the 7, then slide to 9, but don't pick again for the 9.
The 5-7-5, 7-5-0 are indeed hammer-ons and pull-offs. The same legato notation works for both: if a note is followed by a higher note, it will be a hammer-on; if it is followed by a lower note, it will be a pull-off. So in your example, 5-7-5 is a hammer-on (5-7) followed by a pull-off (7-5). The 7-5-0 would be two pull-offs (7-5, 5-0).
I'm not entirely sure about the next one (in this case it might help to see the staff notation). Certainly you would play the chord and then play the hammer-ons and pull-offs on the top line (B string). Possibly you should keep the rest of the chord fretted so it will ring, or at least the 6 on the G string for a gentle pull-off to (0) at the end. But I'm not certain.
The 14-12-14-12 etc with the long line over-top is a long series of pull-offs and hammer-ons.
The 15 to 17 slide with the legato marking has the same meaning as the 7 to 9 slide in your first question: pick 15, slide to 17, don't pick again. The 17 to 10 slide means pick the 17, slide to 19, and pick again.
