Campfires come very handy in Fortnite. Although you can't find the portable ones anymore, you'll come across a good number of fixed campfires littered all across the map.
Just like the waters in and around Slurpy Swamps, the campfires in Fortnite also restore health when lit.
Campfires in Fortnite
These campfires are usually located close to open areas. Most of them aren't lit so you'll need to set them on fire to enable their healing abilities.
It's not very difficult. All you need to do is approach these campfires and interact with them. That's what will set them on fire. However, these campfires cost 30 wood to activate so that's something you will need to look out for.
Here's a map showing all the campfires on Fortnite island.
Once you've managed to make your way to one of these campfires, all you need to do is activate them like I've mentioned before. You'll notice your health bar filling up for as long as you stand in the vicinity of these fires. I'm not sure of the exact value but you gain around 2-3 HP for every second you stand close to a camp fire.
Once you've lit the fires, all you need to do is dance here. Any dancing emote will do. Do that, and you'll end up completing a Fortnite Season 7 week 3 quest. This is an easy way to earn 30,000 XP in my opinion.
Do keep in mind that you're still vulnerable to gunshots. So it's wise if you build up a box around you and the campfire while attempting this mission. Or it's best if you have a team mate watch your back while you complete this mission.
This is probably one of the easiest quests that you have on your hands this week.