When I buy ground beef it is packaged in 5 pound packages. I crumble it up and cook it in a large deep-sided skillet then carefully drain off the grease.
After letting it cool, I weigh it out into 1 pound portions wrapped in plastic wrap put into the freezer. After the packets of meat are frozen, I slip them into a large resealable plastic bag with a label, sharing the packing date, for future use.
On the last package of ground beef, as I usually buy 3 to 4, I measure out into 1/2 pound portions. These come in handy for recipes that we feel a full pound is too much or we have company and I want to increase a recipe just a little versus doubling the amount.
Having the hamgburger already cooked does save on some of the prep time. For example, when cooking a pot of chili you don't have to wait for the precooked hamburger to fully thaw before adding it into the pot with all the other ingredients.