I have a limb pile, mostly apple tree including some stumps. In another area I have a tree pile. No burning, just let nature take care of them.
I burn garbage paper and cardboard and when I get too many cardborad boxes. I always use diesel fuel and handheld propane torch. I tell anyone who will listen to me, don't ever use gasoline.
Years ago when my nephew was about 14, he and his buddies were playing with gasoline, throwing on the ground and lighting it. Some got on his pants and he got burnt. When his parents came home he was sitting at the kitchen table with his leg up on the table and skin dripping off of his leg. He had to get skin grafts.