I studied a thing called Shell Chords which is much like "essential Chords". However, it is bit of a Jazz Guitar 101 concept. But unlike "essential chords", you can google "shell chords".

Shell Chords (aka guide tone chords) are basic jazz guitar chords and are essential knowledge for every jazz guitarist. Having a good understanding of shell chords will make it easier for you to learn more complex chords later on.

Shell chords only contain 3 notes:

The 1, also known as the root.
The third: 3 in major and dominant chords, b3 in minor chords.
The seventh: 7 in major chords, b7 in dominant and minor chords.
The third and seventh are the most important notes of a chord because they define if a chord is major, dominant or minor.


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