Installing Windows 10 on an external hard drive is a great way to create a portable Windows installation that you can use on any computer. By following this guide, you should be able to successfully install Windows 10 on an external hard drive. However, keep in mind that performance and compatibility may vary depending on the computer and external hard drive you're using.
After installing Windows 10 on your external hard drive, you'll need to configure it to boot on any computer: install windows 10 on external hard drive