Watch the Outlining Cmin7 online guitar lesson by Fareed Haque from Bebop Improv Survival Guide
The basic chord, arpeggio and scales on Cm7. Typically jazz musicians will use the major 6th - in this case "a" natural. Rock guitarists, Asian guitarists, Eastern European guitarists who have played a lot of folk music may find the A nat strange and may be more accustomed to the b6 - Ab.
Learn em both!