I am trying to use a software called guitar pro to copy the sheet music and play the tracks. I am currently stuck in this track as I am not able to understand what does the dot and the little symbol above the notes (in the blue circle) mean. Any help is really appreciated.
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 (parentheses 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.
That with the half sign means that the tab wants you to bend a half-step up. In the second bar it seems the tab wants you to bend a half-step up and then bend back down.
While the above answers are correct for the first measure, the lines in measure 2 indicate pre-bends, not a bend up and back down. Bend the note to the correct pitch before picking it, pick the note, and then let the bend relax. This should help:
