I have located the most relevant question for creating bootable USB driveinstallation media for Windows 10, but it's not really a canonical post. That only covers UEFI (what about BIOS? machine compatibility?) and the answers are very, very unsatisfying. However, this question has made clear that:
Given my failed attempts to bootinstall Windows 10 32-bit from bootable USB media for the past few days, and I wasted so much time looking for relevant post on SU, I feel the question I have might actually be the same question that many end users wanted to ask.
What I am suggesting here is to have a canonical post that would first explain the requirements to create bootable installation media for Windows 10. Then explain how to create one with noted compatibility. That would tell end users "if you create this way, it will work for this machine only".
I hope that by having the new canonical post for Windows 10, end users would not waste their time trying to create bootable installation media that might not work for their machine. I had to waste a few days to learn the fact the hard way, before I decided to bring this matter on meta SU here.
Above all, can we have a canonical question and answer for Windows 10? This would be a one-stop resource for end users to create bootable installation media for Windows 10 without issues.