Because bookmarks automatically and only sort alphabetically, if you start the menu bookmark names all with M or 'menu', or any other symbol you'll remember, they'll group together. It lets you have a lot of bookmarks but still easily find one.
I also use 'i' to start ingredient-based bookmarks, 'c' for selections from a given cookbook (often a library or borrowed book, sometimes a newly arrived book), 'z' for bookmarks relating to my own experience (z. made, z. on deck, z. garden club hosting, etc.)