How to build 7th chords and what are the steps involved in creating them?

To build a 7th chord, start with a triad (three-note chord) and add a fourth note that is a seventh above the root note. The steps involved are: 1. Determine the root note of the chord. 2. Build a triad using the root note, a third, and a fifth above it. 3. Add a seventh note that is a seventh above the root note to create the 7th chord.