Which words in a title should be capitalized?

The first word and all the important words, maybe not the smaller words like the, a, to, at, of ...

The first letters. For example, Seedfolks should be capital since it's a books name and should be underlined. let me give you a hint, remember that book titles are supposed to be capital and underlined, I think that if you are writing a quote in this sign " then it has to be Italicized meaning curved.