Your classes on Microsoft Office will clue you into how to use footnotes and endnotes in Microsoft Word, but they might not tell you when you should use them. On that front, Windows Central has you covered. (In fact, they tell you how to use footnotes and endnotes as well, in case you forget).
From Windows Central:
So while footnotes are used to provide quick, as-you-go information throughout a document, an endnote should be used to provide pertinent information at the finish, or “end,” of a document, to provide some sort of context or conclusion, not unlike a form of written punctuation.