The 1st note is played but the 2nd note is produced by hammering on the left hand finger, which plays the 2nd note.
The 1st note is played but the 2nd note is produced by pulling off the left hand finger to sound the 2nd note.
Play the 1st note and while maintaining the pressure one the string slide to the 2nd note.
Vibrato is controlled with the left hand finger that frets the note, move the finger back and forth in the direction of the adjacent strings.
The note is played by the left hand finger which bends the string (from the note indicated in the tab to the pitch of the note in brackets).
Bend the note indicated (from the pitch of the note in brackets), play the string while bent, then return the string to its normal position.