How can I learn to play rhythm guitar?

I’m just learning how to play guitar…I know the D, G, and E minor chord. My friend asked me to be in their band, and I told them to give me some time to improve. about a month or so…
how can I learn quickly? more chords, and arpeggios?
and power chords?
I seriously cannot do a power chord to save my life 😮

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