This is a lesson that I learn from watching Damian Erskine's video, but simplified.
Starting from the G note on the 3rd fret of the E string, you play the 5th interval.
You can use it as a quick riff when in the key of G.
Notice that all the notes are in G major scale.
The pattern sounds nice because you are outlining the 9th chord.
Have fun and experiment.
