Ask HN: What should I learn to build side-projects in AR or VR?

I am a junior web developer that likes to create side-projects. I am interested now in building something in VR, maybe AR if it’s easier (is it?).

I am not interested in getting a job on Facebook or anywhere, nor founding my own ambitious startup. I just want to build simple things that I like to use.

I have zero knowledge of the space. I just started googling about it and thought that maybe HN knows better.

What’s the easiest way to build something simple in VR or AR?