You don't need to learn perspective to draw backgrounds https://twitter.com/arvalis/status/1277332671450894337

Okay let me break this down:
This is a current piece I'm working on, and generally when I sketch stuff out I just roughly align stuff where they need to go, then if I REALLY feel like it feels off, I put the grids in to check.
Do they align to horizon line/vanishing point? No.

To me my goal is to get the mood and feel of the scene right, and I have enough experience to make perspective LOOK like it's about there, when really it isn't.

Does it matter that it's aligned to the grid? Not really, but I like doing that just in case.

That said, if your job is to work in a team with other people and a grid would help everyone put things in place for cohesion, please actually learn perspective for the job. You can do whatever you want in your own time.

I'm gonna elaborate on this a little bit:
You'll get better at perspective the more bgs you draw -w-
There's also people who work better with shapes to indicate depth and atmosphere rather than following a grid, like plein air artists.
There's 3D models to draw over.

There are hundreds of photo references to use, perspective rulers in programs, etc.
There are so many problem solving methods to create bgs so limiting yourself will only limit your flexibility and creativity to draw them.

Good luck :D