What notes make up a chord?

Most chords are built from three notes pulled from a scale - the 1st, 3rd, and 5th. This three note combination is called a triad and is the foundation of nearly every chord you'll play in worship music.

The G major scale includes the notes G, A, B, C, D, E, and F#. Count out the 1st, 3rd, and 5th notes and you get G, B, and D. Those are the only three notes in a G chord. On a chord diagram you'll play a note on every string, however they are just repeats of the 3 notes.

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This is true of any major or minor chord. It's always a 1-3-5. What changes between major and minor is which version of the 3rd you use. See major versus minor chords for how that works.