“”You fold a fitted sheet by nesting the points of the four corners inside each other. If you do it in the correct order, you have already got the sheet folded in quarters.””
I remember when directions were the thing a few years back and I think it was “do the corners inside out” and I could do it for a number of years and after that, I just don’t bother.
If things are going as I plan, I will wash/dry them and put them back on the bed if not, I do the best I can, stack the fitted with the flat and shove them in the closet...You know what - it doesn’t make any difference when you change sheets..they don’t look any different when you put them on than ones “properly” folded.
Heck, the way sheets are made/sold today with elastic all the way around, you’re lucky if you can get the danged things on the bed in the right direction before lunch time! No matter how many times you look at the corners and decide, “this is right”, it’s not when you try to make it fit!!
I use spandex sheets (she on amazon) and it doesn't seem to recall matter since they really stretch to fit.