My wife’s hard drive died so I needed to create a USB Drive to install windows on my Mac. Bootcamp wouldn't work for me. So we have to go DEEP into the abyss of creating a bootable disk.
Here are the directions from Free Code Camp to Build a Bootable ISO From Your Mac's Terminal.
https://www.freecodecamp.org/news/how...
You used to be able to use bootcamp on the Mac, but that won’t work anymore.
I wasn’t successful installing windows 10, but it was due to more hardware issues. The USB Drive was just fine.