If you only ever learn one scale, this should be it. This form of the minor pentatonic scale is very widely used by many players in many genres.
Scale Patterns are moveable scales where fingerings don't change from key to key. The root note (green dot) names the key of scale. What does this actually mean? It means you simply learn this pattern and you immediately know all 12 keys. You just need to place it on the correct fret to play the scale in a particular key.