Don’t worry all they are is weird Greek names for scales and there’s really nothing to it.
The mixolydian mode or scale has the same notes a a standard major scale but all you do is start the scale on a different note.
The example I have used is a G Mixolydian scale, this has the same notes as a C scale.
The notes are C D E F G A B C, but we run them G A B C D E F G.
This scale is used over a G7 chord, or it’s relatives such as G9, G13, G6, G11, Gsus4 and similar variants when they fall into the key of C or if they appear in a song that uses G7 and another chord from the key of C preceeding or following it.
Download PRINTABLE VERSION of mixolydian Scale fo Guitar in G