Actually, for proper breadcrumbs, which you can not only cook with, but also store, refrigerate, freeze, et cetera indefinitely, you take your stale (failing that -- fresh) bread, break it up into fist sized or smaller chunks (just rip it apart, it's fun), nuke or bake or grill it for several minutes until you smell toast (but not smoke), and then process it for a minute (blenders and food processors work equally well).