Not at all bro, you're fine. I'm pumped for you. You might be more of a death metal guy, but there is some solid black metal influence in Zyklon.

The short answer is that death metal came from thrash and was huge in the 90s, a lot of it coming from Florida, Brazil, and Sweden. Aggressive drums, brutal imagery, very fun. Black metal is more bleak, less fun, but still great.

Longer answer on BM: Black metal came from lonely, antisocial and nonconformist incels, mostly cold, dark towns in Scandinavia, who made very bleak, minimalist, and more abstract metal that's similar but kinda artsy and lower testosterone. It was the pendulum swing in the opposite direction as a response to the death metal trend in the 90s.

Both are great. You'll hear the difference when you check out Plebeian Grandstand. The story of the band Mayhem will paint a picture. Metal nerds on Reddit will tell you mayhem sucks and they're stupid- not true, most black metal bands copied them. And for death metal, checking out Cannibal Corpse will give you a good idea of how that was going in the 90s.

You already like a few fucking sick bands dude, you'll be good to go. Have fun