Some campgrounds won’t allow open fires without a firepit and lugging around and packing a firepit can be a royal pain. Enter the Primus Kamoto Openfire Pit. It folds up for easy storage and transport, but its ash tray prevents ground damage from the fire. It even includes a grill so it can be used for cooking. I found a great review of it at https://coolofthewild.com/gear/review-primus-kamoto-openfire-pit .
Before starting a fire outdoors, review “Leave No Trace” principles and safe extinguishing practices. Always check the campground regulations for information on where you can build a fire, appropriate wood to use (some campgrounds sell firewood) and potential burn bans.