Each tab displays a letter symbol for the technique that’s to be used:
H = Hammer-On
P = Pull-Off
Sl. = Slide
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0-2: Does it mean hammer-on? Start playing on open-string and hit 2nd note?
Since 0 is open-string, I am not sure if it is possible to play as ‘slides”
Yes, H/O. Check out this lesson for an overview on how to do this technique.
You cannot slide open to 2. This would be a hammer-on.
2-0: Should I play starting with touching 2nd note and take off my finger?
Again, since 0 is open-string, I am sure if it is possible to play as “slides”
Correct, the above link covers pull-offs too 🙂