The key to making some bomb ass dry rubs and marinates is do it different every time but write it down otherwise youll end up making some bomb shit and have no clue what it was.
Steaks I usually just do a lil dry rub, chili powder always, vary the other shit. Burgers same type of shit, sometimes crack an egg or two into the ground beef, throw some bread crumbs in there too.
And for slowcooking ribs, briskets, pork shoulders etc, my fave shit to use is some good old brown sugar to make it sweet on the outside. Any parts that got fat on it poke it with a toothpick a lot so the rub stays in their.
My most crowning achievement is a 8lbs brisket haha shit took like 8-10 hours or something retarded but fell apart like butter when I cut it.