so i wanted to try out the gas grill that's currently sitting unused in my brother's backyard. it's his friend's grill and we've been given free rein to use it. that being said, i wanted to see if serious eaters had any quick tips on gas grilling before i got started. i've never used one before, so i wanted to make sure i wasn't committing any heinous newbie mistakes! should i grease it with oil before heating it up? is it better too cook certain items on it than others? how quickly do i need to clean it after use? stuff like that. any help would be greatly appreciated!