Ribbed hems are all well and good and they are wonderful for sweaters and other casual garments. However, what do you do if you want a hemline that does not stretch? You can knit the picot hem, https://www.instructables.com/id/How_to_knit_a_quotPicotquot_Edge/
However, this can be a bit too fancy sometimes and you might be wanting something a bit plainer with a bit more dignity. The answer is the straight edged hem.
This is a very easy hem to make.