Please if you choose C and G as your basic idea, the passing note will be D, F. Is this correct. Also the lesson 2 is confusing, didn\’t understand anything apart from inversion
D is a passing note between C and E and F is between E and G.
I have just fińished 2nd lesson as well.
It all depends on your underlying harmony. If your harmony is the C major triad, the chord tones are C-E-G. If your melody has two chord tones, C and G, and you want to connect them with passing tones, then the passing tones would be D-E-F. Even though E is part of the chord, you are treating it as a passing tone and not as much a structural chord tone. But it is still a chord tone. Labeling things analytically always has room for judgement calls. If you are calling that E a structural tone, then the passing tones would be D (between C and E), and F (between E and G).
Very comprehensive and excellent answer sir, thanks