Pentatonic scales are not only one of the first scale concepts that we tend learn as guitarists, but they are without a doubt at the core of almost every contemporary musicians improvisational tool-kit.
Pentatonic Scales represent a literal storehouse of musical ideas, since Pentatonic eliminates the half-steps found inside the full diatonic scale. There are a number of things you would of course need to do to become highly proficient at playing lines with Pentatonic across the entire guitar neck. However, one method I've taught that really helps get this going for my own students is the study of creating three-octave pentatonic shapes. I demonstrate three shapes in minor tonality in the video lesson. Learn these, play them in relative major and create your own as well.