Which Polaris RZR accessories should beginners buy first?

I’ve recently gotten into riding my Polaris RZR more often, and I’m realizing there’s a huge world of upgrades available. The stock setup is fine, but once you start hitting rough trails, you see where improvements are needed. When it comes to Polaris RZR accessories, what would you say are the first essential upgrades for new owners?

Do you think roofs and windshields should come before things like bumpers and skid plates? Are aftermarket harnesses really necessary, or is the factory belt system good enough for casual riders? For lighting, is a light bar more useful than additional pod lights?

I’ve also been debating about storage setups. Do most riders prefer bed-mounted racks or overhead racks? And for long trips, do cooler boxes hold up well in the RZR’s cargo space?

I came across the StarKnightMT website while browsing Polaris RZR accessories, and they seem to offer a wide variety. Has anyone here ordered from them? How’s the durability compared to other popular brands? What’s the one accessory you’d recommend a beginner shouldn’t skip?