The way I remember the Pentatonic Scale is by remembering the 5 Shapes and giving them rememberable names. (The following Scales are in E Minor)
Give it a unique Name.
Shape 3 (Quite a similar pattern to Shape 1)
The Minor Pentatonic May be used for Improvising and possibly Soloing. Making it a good thing to use. You may have noticed I stopped at the Twelth Fret. that's because there are only 12 Notes...
E, F, F#, G, G#, A, A#, B, C, C# D, D#.
To go higher, just repeat those shapes. Also remember that these shapes are in the Key of Emin. To go to G for example, Shape 1 starts on the 3rd Fret, and the rest of the shapes follow after (and repeat behind)
Here are all the Frets you can use using the Shapes.
So that means the notes you can use are...
E, G, A, B, D.
Remember to practice those Scales, try improvising with the Pentatonic and enjoy!