I've found that some random issues like unexpected frame stutter or VR headset not being detected need a full power off of everything to fix sometimes. (Power off / disconnected. Reboots don't work)
Stuttering is present in SteamVR due to lack of async reprojection.
Thats why I'm using Envision which is an interface for a stack of a bunch of different open source VR stuff.
It's quite a bit more finicky and fragile, but it at least has reprojection.
I've switched to using it as my daily driver, and depending on what applications you use, the water is either fine, or is full of piranhas.
Using VR, for example, is still a massive pain in the ass, and requires me to boot into windows when the tenuous stack of software driving it on linux decides to stop working because it's a full moon out.
Touch anything the wrong way, and you're digging through random config or build files to fix it.
In my brief testing, I found this to be the case as well. ALVR was constantly having a bad time (stutter, frame drops, audio drops), and the lack of reprojection in SteamVR was miserable.
WiVRn (through Envision) was a bit jank, but worked much better.
You're slightly off here.
Elon (and Tesla as an extension) doesn't like LiDAR, and doesn't use it in any of the vehicles. Cost, complexity, and sensor fusion issues make it undesirable to them.
Tesla is using a vision only approach for their various driver assistance features, including FSD (and you should be able to find presentations where he mentions that humans use vision, so the cars should too). Whether that is a good thing or not is up to interpretation.
None of the past or current Tesla models have LiDAR sensors - only radar, ultrasonic, and 7/8 cameras (with radar and ultrasonic sensors being absent from some newer vehicles)
If by "first game" you mean HL1, you could try playing "Black Mesa" which is a fan remake of the game, in the same engine that powers HL2. It's not a 1:1 recreation, but it's close enough (and I feel it improves on some things).
HL2 is also 3 seperate games (HL2, HL2 Episode 1, HL2 Episode 2), so make sure you have all of those in your library.
At the very least, I'd suggest playing HL2/EP1/EP2 before Alyx, since those would provide the expected background for Alyx, despite it technically being a prequel-ish thing.
Might be worth trying WiVRn, which I've linked docs for in reply to the other guy :3