By default, Windows 10 asks you to create a Microsoft account when you log in to Windows for the first time. But if you’d prefer to use an email that you actually use for, you know, email, that’s an option too. Windows 10 accepts new non-Microsoft email accounts on setup, and you can create a new Windows user with any email account.
Doing this will get you most of the benefits of using a Microsoft account—like syncing your settings between Windows PCs. But you won’t have to remember an entirely different email address to do it.