This is how bending notes on guitar is notated. The “dot” is the starting note and the inverted V connects to the note you bend to. The TAB is a big help in this case. In bar 1 beat 1 you play a G (2nd string 8th fret). On beat 2 you play a Gb (3rd string 11th fret) and bend up a half step to a G. On beat 3 you play a Gb (3rd string 11th fret). On beat 4 you play an F (3rd string 10th fret) and bend up to a Gb. This descending pattern continues to the end of the second bar.
In the second two bars the notation indicates you bend both up and down. On bar 1 beat 2 you pre-bend the Gb up to the G (verticalparentheses around starting note and vertical instead of curved arrow in TAB) and play the G on beat 2. On beat 3 you bend down from G to Gb, etc.