This is the first Animal Crossing that I've played more than 5 minutes of, so maybe this just just something obvious that I don't get, but when I catch new fish, bugs, fossils, etc. Should I be donating them to the Museum instead of selling them for bells? What does the museum do differently from that encyclopedia that you have on the bottom screen to keep track of the things you've caught? Is there some kind of purpose that I am entirely missing?
And if I donate all this stuff, is there another way to get a lot of bells that I don't know about? I owe Nook a bunch of bells and nice fish, fossils, etc. seem to command a lot more bells than my stacks of oranges.