root, 3rd, 5th, 7th, 9th, 11th, & 13th refer to chord tones
(a typical major or minor chord is made up of 3 notes, Root, 3rd, & 5th.....any chord that consists of more then 3 notes will be notated..ex. D9)
# & b are note alterations, a sharp (#) raises the note a half step (1 fret) a flat (b) lowers the note a half step
2,5,1,....indicates what degree of the major scale a chord is built off of.
I hope this makes some sense to you, if not feel free to ask us for help, good luck.
