Fortnite is a popular online video game developed by Epic Games. It is a battle royale game where players fight to be the last person or team standing on a virtual island.
As for the free skin, it varies depending on the promotions and events offered by Epic Games.
It is best to check the official Fortnite website or social media channels for any current offers. Here some new update on How to get free skins in Fortnite (July 2023)