Let's take a look at some common triad shapes. The first grouping will use G as the root note.
G Major Triad
Major Triads are constructed with the 1st, 3rd, and 5th notes of the major scale
This next grouping of common triad shapes will use E as the root note. These shapes will be in "first inversion" which means that the third of the chord will be in the bass position.
E Major Triad
1st Inversion
Major Triads are constructed with the 1st, 3rd, and 5th notes of the major scale
This next grouping of common triad shapes will use A as the root note. These shapes will be in "second inversion" which means that the fifth of the chord will be in the bass position.
A Major Triad
2nd Inversion
Major Triads are constructed with the 1st, 3rd, and 5th notes of the major scale