How do I get a free skin in Fortnite?

Hey there, I'm curious to know how one can go about acquiring a free skin in the popular game Fortnite. I've seen many players sporting some really cool skins and I'm wondering if there's a way to get my hands on one without having to spend any money. Is there a specific event or challenge that I need to complete, or are there any other methods that I can try out? I'd really appreciate any insights or tips you might have on this topic. Thanks in advance!