There are few resources because feet doesn't have any depth that isn't in other events. There's not much to the technique, or not many new algs to learn, beyond just learning to do the moves quickly. A lot of knowledge transfers directly from 2h.
OH is also a solve-with-handicap type event, but it actually does have a lot of depth. Since 2gen turns are so much faster than other turns, and because different non-2gen turns have different speeds and involve quite different hand movements, there's a lot of technique involved. Changing the way you do intuitive steps or particular algs can change their speed by a lot.
Anyway, OH is really fast compared to any other handicap event, so it's still exciting to watch and you can race other people doing normal solves. And of course, it's also much more useful - you can do OH solves while walking around, eating, driving, etc. whereas feetsolves require a relatively open space and bare feet.