Signing up for your own Microsoft account lets you use online services like storage and family settings, and helps keep your settings in sync across devices. When you add payment data to your account, getting apps, subscriptions, movies, TV, and games is easy on your Windows 10 devices.
By keeping your password secret, and adding extra security info like a phone number or email address, you can help keep your files, credit cards, browsing history, and location info more safe and sound.
To update passwords, security info, and payment options, visit the Microsoft account website.