Since someone is going to point this out, it might as well be me:

Ian's Knot [1] not only is super-fast (once you've learned it properly), it also ensures you are tying a strong knot.

Also, a heel lock [2] is a independent thing which is also good to learn.

  [1] https://www.fieggen.com/shoelace/ianknot.htm

  [2] https://www.youtube.com/watch?v=OBbc6TackDQ