I know probably 40 knots. I use the ol' double slipped reef knot for my shoes. Sometimes I tie a granny knot by accident and then I back out the second loop and finish a reef knot. Sometimes I capture the whole thing in another slipped loop if the laces are way too long. Sometimes I double or triple up the knot.
It really doesn't matter what knot I use to tie my shoes. The shoelaces make way more difference than the knot. I can triple-knot my laces, and if they've no tooth, they're gonna come undone. If they have tooth a-plenty and I use a single knot, they aren't going anywhere. It doesn't matter, because even if they come untied, I'll just tie them again. If I really want them to stay, I don't ship them, and weave the running ends back into the laces.
It really doesn't matter what knot I use to tie my shoes. The shoelaces make way more difference than the knot. I can triple-knot my laces, and if they've no tooth, they're gonna come undone. If they have tooth a-plenty and I use a single knot, they aren't going anywhere. It doesn't matter, because even if they come untied, I'll just tie them again. If I really want them to stay, I don't ship them, and weave the running ends back into the laces.