If you have an old user account on your Mac that you can no longer access, there's a way you can still get into it as long as you have an "Administrator" account on that Mac. Just get into the System Preferences from the Apple Menu and click "Users & Groups". Then click the lock icon and enter the admin name and password. Select a user, and then click "Reset Password".
On Sunday's Tech Guy show, Jason Snell of SixColors.com was filling in for Leo Laporte and shared a tip about managing your Apple ID. Not many people are aware that Apple has a page for doing this at appleid.apple.com. You can change the email addresses and phone numbers associated with your account, add/change your trusted phone number for two factor authentication, change your Apple ID password, change payment and shipping info, and more.
Gordon has been getting a notification that he's out of state or even the country. Leo says that can be a phishing email and he should be suspicious, especially if it has a link to click on. It's also a new thing that most sites are doing now to advise users if there's different activity, even if it is his own. It's also likely that the warning gets triggered when it doesn't know where he is, so it defaults to a generic IP. It's good to pay attention to this, though.
Having a password protected login for Windows is essential to keep your data safe in a more public space. If you're just using your computer in your own home, however, it can be more of a nuisance. By default, Windows prompts you to create a password, but there are ways to get around this.