I've folded an alarming number of sheets. Here's my favorite folding method, with no complicated steps required.
https://www.wired.com/story/how-to-fold-a-fitted-sheet/?utm_source=dlvr.it&utm_medium=blogger
https://www.wired.com/story/how-to-fold-a-fitted-sheet/?utm_source=dlvr.it&utm_medium=blogger