Hey there, Yoontaek. If you’re having specific problems with modulation, or anything else, post those questions in a separate thread in this forum. I’m sure you’ll get a lot of help, and Eventide is very involved here.
Quick suggestion: if you are focusing on modulation, delay and reverb, have a look at SpaceTime. It packages all three effects together in one algorithm. That might be easier to have in one spot.
Here’s the place where everyone has congregated to upload their H90 Programs. Free to use, and plenty there to get you started.
https://patchstorage.com/platform/eventide-h90/
I would say that every kind of effect (and most combinations) for many styles of music are covered. Several uploads [Program Lists] are whole groups of related Programs, up to 99 in each.