"With a note of music, one strikes the fundamental, and, in addition to the root note, other notes are generated: these are the harmonic series.... As one fundamental note contains within it other notes in the octave, two fundamentals produce a remarkable array of harmonics, and the number of possible combinations between all the notes increases phenomenally. With a triad, affairs stand a good chance of getting severely out of hand."
The hardest thing about playing chords when you get started is changing between them. To effectively change between chords, you need to be economical with your movements. Spend a bit of time thinking about where your fingers need to be for each chord, and work out the most efficient way to move from one to the other. For example, from a C major, you can flatten your index finger so it covers the first string too and move your middle and ring fingers both down a string to switch to an F. Easy changes to start with are between C major and A minor and G major and E minor.

When playing seventh chords, guitarists often play only subset of notes from the chord. The fifth is often omitted. When a guitar is accompanied by a bass, the guitarist may omit the bass note from a chord. As discussed earlier, the third of a triad is doubled to emphasize its major or minor quality; similarly, the third of a seventh is doubled to emphasize its major or minor quality. The most frequent seventh is the dominant seventh; the minor, half-diminished, and major sevenths are also popular.[79]

Learn the C chord. The first chord we will cover is a C chord—one of the most basic chords in music. Before we do, let's break down just what that means. A proper chord, whether played on a piano, a guitar, or sung by well-trained mice, is simply three or more notes sounded together. (Two notes is called a "diad," and while musically useful, is not a chord.) Chords can also contain far more than three notes, but that's well beyond the scope of this article. This is what a C chord looks like on the guitar:
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