if i wanted to improve my improvisation and/or songwriting, would it be useful to learn a new chord every day and see how it feels when played after/before/between/instead of other chords?
no. i think doing this will trick you into becoming very uninspired, because a chord includes everything about how/when/where it was used, in the actual song or piece of music. And there's infinite hows/whens/wheres. and each of those things makes everything different about what the chord does. so what i'm saying is, you'll never be able to get a list of all those. So if you say you're gonna "learn a chord" every day, that implies that you're going to be getting them from some list, but there is no list. because it's infinite and there's no order. and some of them are the same, but all of them are the same and different from each other at the same time. Anyway, my point is, the only way to get chords is to either find them how they've already been used in music you know in love, or make them up entirely. so if you're doing it that way, then i think it could be cool.