My favorite way is how French website "Le Monde Diplomatique" does it : the footnotes appear at the bottom of the screen in context as you scroll so that only those referred in the currently visible text are displayed. It avoids awkwardly clicking on tiny superscript numbers and annoyingly scrolling back and forth between text and footnotes. For an example : https://www.monde-diplomatique.fr/2021/01/PIGEAUD/62633