So far, all of the chords have been built with the root as the lowest note. But you can create subtle variations in sound by reordering the notes so that a different note is at the bottom. This process is called inversion.
A triad with the root as the lowest note is said to be in root position.
A first inversion triad has the third of the chord as the lowest note. The root is then transposed up an octave.
A second inversion triad has the fifth of the chord as the lowest note.