what is an endnote? do you put a number after a quotation and then do you have a page at the end listing all of numbers with corresponding sources. I don't get it

Well, I think a footnote is in a textbook when a number is after a word (that almost looks like an exponent in math), and at the bottom of the page, it has all the words with their numbers on that page. Next to each word/number pair it has a definition or explanation. Hope I helped!