Protecting your PC with a strong password is essential in order to keep yourself secure. However, that's not to say that all Windows installations need one. If you're setting up a virtual machine, ditching the password will enable you to sign-in instantly, while remaining protected by the password on your host device.
Whatever your reasoning, getting rid of your password is a straightforward affair. It's only possible if you're using a local account though - online Microsoft accounts must be password-protected at all times.
Open the Settings app (Win+I) and click the "Accounts" section. Click the "Sign-in options" page from the menu on the left. Under the "Manage how you sign in to your device" heading, click the "Password" option.
Next, click the "Change" button. Type your current password into the popup dialog and then press enter or click "Next".
On the next screen, you choose your new password. To remove your password, leave all three of the fields blank. Although this isn't allowed during Windows setup, it works fine here. Click the "Next" button to confirm the change.
Your account will now have its password removed. When you reboot your PC, you'll be signed in automatically, provided your device has only a single user account setup.