I'm learning my grade 4 guitar chords and I want to know when it says like gm7 and cm7 are they minors or majors?

can you also tell me how toplay the gm7 please

a little "m" means minor, the 7th means "dominant 7th" which means you add the dominant 7th interval to the chord...the dominant 7th is the note a half step below the major 7th.
Actually called Mark!

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