The Open Chords are among the first chords most guitar players learn.

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The reason to this is that they are the most easy to play, and they are powerful and versatile enough that you can play around 70% (or more) of pop and rock songs with them.

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If you combine them with a capo, you can play in any key with ease.

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Watch the first video to learn the positions, and the second one for some exercises.