This article provides instructions on how to create a bootable Windows 10 USB, how to create a bootable Windows 10 USB for repair and installation, and information about why you might want to do this.
How to Create a Bootable USB Flash Drive for Windows 10 (Tutorial)
If you want a copy of Windows 10 on a USB stick that you can insert into a compatible computer, boot into, and bypass the default installed operating system, here's what you'll need:
Download the Windows Media Creation Tool.
Launch the Media Creation Tool and click Accept.