I make mine in the pressure cooker. Bones, big chunks of carrot, onion, and celery. A tablespoon of vinegar to help dissolve the collagen out of the bones. Couple of bay leaves, a few peppercorns. It’s up to you, really. 3 hours under pressure, and I usually start it before I go to work so it switches to “keep warm” for a few hours before I get home. I don’t season it until I’m ready to use it.
A slow cooker works, too, at least 8 hours on high, or if a stove is all you have keep it at a very low simmer for 8-12 hours.
For extra flavor you can salt, pepper, and roast your bones in the oven before starting your stock. Make sure you deglaze the roasting pan and add that liquid to the stockpot!
The plain broth works great for cooking. Anytime a recipe calls for water I add broth instead.