Brand new to MTB - bike setup

Nice bike!
I'll chime in here since I have 3 bikes, 2 of which each have multiple wheelsets.
After owning multiple bikes as well as multiple wheelsets for individual bikes, here are some observations.
A second wheelset is cheaper than a second bike, but the bike's intended purpose (XC, enduro, etc.) doesn't change just by changing wheels/tires.
But if you have a second bike, then you can choose an entirely different genre / discipline (FS vs hardtail, etc.)
So a second bike may make more sense (if that's what you're looking for.)
If you do choose to go second wheelset route, ideally you'll want the convenience of just pulling the axles and dropping the wheels, then popping in the second wheelset.
In other words, you won't want to remove the tires, brake rotors & cassette to move these items from one wheelset to the other.
So there are additional expenses besides the wheelset itself -- new tires, cassette, rotors.
At first blush, a second wheelset sounds like it'd be a cheap way to go -- it's not. Cheaper than a second bike but not cheap by any means.
After buying all this stuff, ideally rotors and cassette should line up perfectly with calipers and shifter/derailleur settings.
In other words you'll want to set the wheelsets up with identical spacing from one to the other, so you don't have to adjust calipers & shifter.
Cassettes can be shimmed (very little) on Shimano drivetrains but I don't know of any way of shimming the cassette a SRAM XD driver.
That'll be 100% luck -- either it'll line up perfectly or it won't. If it doesn't, you'll have to dial the barrel adjuster every time you swap wheelsets.
As for shimming brake rotors, that's simple (rotor shims are available) but simple is not the same as easy.
It's a trial & error affair. You can only shim one direction so you have to set the brake up with the most outboard rotor and then shim the other one out to match.
This process can take time & patience. The shims are very thin and you want everything to be just right.
All these words to say this: once all is set up correctly, a second wheelset is nice to have, but it's expensive and to do it right, you have to know what you're doing.
Also in my opinion it doesn't make sense unless you have to have a good reason for doing it. It won't make your hardtail into a FS, obviously. It's evolutionary, not revolutionary.
Here in the PNW, we have seasonally disparate riding conditions, so I have summer wheels and winter wheels.
Tires and rims are wider and tread more aggressive for winter use (aka mud.) Summer wheels are set up lighter & faster.
But I wouldn't have a second wheelset just to make minor changes in tires to see if I liked, say, a narrower tire better. If that were the case, I'd just change tires.
These are my opinions... nothing more. But I hope they help, if only a little.
=sParty