Always preheat your grill with the lid closed for at least 15 minutes, this will help prevent food from sticking to the grill.
Direct heat it is best for anything small that can be cooked in less than 20 minutes. Direct heat is is when the fire is directly below the food.
Indirect heat is best for larger cuts of meat that require more than 20 minutes of cooking. Indirect heat is when the fire is on either side of the food .
Always clean your grill before putting any food on it, the cleaner your grill, the less likely your food will stick to it. When you're finished cooking, cut an onion in half and put it on a grill fork, cut side down. Wipe the onion on the grill grates to loosen any stuck-on bits of food.
Once again, it's best to clean the grill after you cook. However, this method also works before you start grilling.
Turn on the grill and give it time to heat up. Once the grates are hot, wipe them down with the onion half. Optionally, you can also use foil sheets directly over the grate here, too.
Avoid opening the lid as much as possible to prevent flame-flare ups that could end up burning your food