You don't have to boil ribs before cooking them but the reason boiling ribs is done before cooking is to render out the fat and tenderize the meat.
Boiling the ribs before cooking them takes 45 to 50 minutes and then they're ready to cook and then bake the ribs in the oven for 2 hours.
Fold some foil around the ribs and then place them on a baking sheet and put the ribs in a preheated oven at 375 F for 2 hours.
Too cook the ribs on the grill take the ribs and place the bone side of the ribs down on the grill and then close the lid and get the grill to a temperature of 300 F.
Leave the ribs to cook for 30 minutes on the grill before opening the grill lid.
It takes 30 minutes to fully cook ribs on the grill.