Participate in official Fortnite in-game events and promotions
Use the Fortnite Crew subscription (paid) for monthly V-Bucks
Use the PlayStation Store, Xbox Store, Nintendo eShop, or Epic Games Store gift cards and V-Bucks cards (paid)
Earn V-Bucks through Save the World (if you have access)
Complete quests and challenges that award V-Bucks in Fortnite (when available)
Check Epic Games promotions on the Epic Games website and Fortnite news pages for legitimate V-Bucks offers
Watch for official giveaways run by Epic Games or verified partners (only through official channels)
Use Microsoft Rewards, PlayStation Rewards, or similar official reward programs where available to redeem for V-Bucks (region/account dependent)