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You can use whatever chords you like.
Tattoo this on your forehead.
What you need to do is learn how every chords sounds with every other chord.
That's a big challenge, so do it bit by bit. But there are no wrong chords. Melody is what makes sense of chords. For example, the most dissonant chord is the flat five, F# in the key of C, say. Used to be called the 'diabolus in musica'. The devil in music. But it's actually a perfectly usable chord if you know how to get into it and out of it.
Diatonic music (using the 'correct' chords for your given key) is (in my opinion) really colourless. Play a C chord and then play something 'wrong'. D, Eb, E, Fm, Gm, Ab, Bb. Now do something else wrong, but just link the chords with melody. See? It works.
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