A Triad is three tone chord it is the basic building blocks of all chords. There are four basic types of triads a major triad, minor triad, diminished triad, and augmented triad.
A Major triad is constructed of a major 3rd and a perfect 5th.
A Minor triad is constructed of a minor 3rd and a Perfect 5th.
A diminished triad is constructed of minor 3rd and diminished 5th.
A augmented triad is constructed of a major 3rd and augmented 5th.
Triad inversions, an inversion of a triad is when the root is not the lowest sounding pitch of the triad and there are two inversions of a triad, 1st inversion and 2nd inversion.
The Root position occurs when the root is the lowest pitch no matter what the order of the other two pitches
C Major Triad(Root Position) = CEG or CGE
The first inversion is when the lowest pitch is the third is the lowest pitch.
C Major Triad(1st inversion) = ECG or CGC
The second inversion is when the lowest pitch is the fifth.
C Major Triad(2nd inversion) = GCE or GEC