OpenStax
Open Stax: Catherine Schmidt Jones: Triads
Learn about triads in this well explained lesson. This site explains the root, first inversion and second inversion of the chords. Test your knowledge with several self checking problems.
OpenStax
Open Stax: Catherine Schmidt Jones: Naming Triads
Learn about the various types of triads. This lesson focuses on the chords in root position. Included in this site are a few self checking tests.