Exercise 2-2-1 video / answers check

Hey Jon,
thanks for the great work on the courses you built, I really like working on it! I can’t find an exercise video for 2-2-1 on your site, also I am having trouble checking my answers on this exercise. Where can I find out if I created the right chords and especially check if I used the right key signatures? Am I supposed to write the chords down with or without using a piano?
Many thanks, Nicolas

I have a made a video explaining the exercise now. It is available just below the lesson.
https://www.artofcomposing.com/lesson/harmony-part-1-1-intervals

Hey there guys,
I’m still having issues wrapping my head around the minor major 2nd and 3rd, what exactly makes the interval minor or major… if the 2nd is minor does it mean the 2nd should be dropped half a step? vice versa for a major? Reason I am asking is because I am getting some weird intervals when doing the 2-1-1 exercise, (example could be e flat P1 sounds the same as m2 and A1 sounds the same as M2) and I am hellbent on not advancing through the course until I completely understand this concept and finish this excercise.