Thanks for the comment
Your translation was spot on!
The best advice I can give for perspective (and this goes for almost any skill) is to look for lots of different
tutorials on it so that you see it explained a lot of different ways. Of course that answer doesn't really address your question...
I actually made this background as a 3D model then rendered it and made adjustments + painted over it. So I didn't have to worry about perspective when making it. That being said, you can still extract the perspective from it by seeing where the parallel lines in the scene converge. I made an image for you to illustrate what I mean here
. See how if you trace a line along the edges of the desk (the red lines) they all converge because they're parallel? And so do the ducts on the ceiling (which are also parallel to the edges of the desks.) Where they meet is where a vanishing point will be. And vanishing points for horizontal lines (i.e., things parallel with the ground) will always sit on the horizon, so you can work out the horizon line from that. The edges of the desk that are parallel to the blackboard (the green lines) can also be traced until they converge to a vanishing point, but it's really far away so I just cropped it out. Side note:
Placing vanishing points closer together will result in a more distorted image. Having them further apart, like in this image, will look more natural.
In short, the scene is in 2 point perspective because the horizontal lines all converge to vanishing points, whereas the vertical lines in the image do not converge (at least not in a noticeable way).
Sorry for the long reply! I hope this helps