How can I properly prepare and cook corned beef, including the process of cutting it?

To properly prepare and cook corned beef, start by rinsing the meat under cold water to remove excess salt. Place the corned beef in a large pot and cover it with water. Add any included seasoning packet or your own spices. Bring the water to a boil, then reduce the heat and simmer for about 3 hours or until the meat is tender. To cut the corned beef, slice it against the grain into thin pieces for tenderness. Serve with your favorite sides like cabbage and potatoes.