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If someone hacks your password, you can change it - as many times as you want.

Treat your password like your toothbrush. Don't let anybody else use it, and get a new one every six months.

Weak passwords are a crook's best friend. Make yours long and complex, and change them often - not just on your bank account but on your email and social media, too.

The best thing to do is always keep randomly generated passwords everywhere and use a password tool to manage it, and then you don't have to remember those passwords at all, just the master password that unlocks the database.

By now, you've heard endless warnings about the risk of short, trivial passwords. There's a good chance you ignore them.

If someone hacks your password, you can change it - as many times as you want. You can't change your fingerprints. You have only ten of them. And you leave them on everything you touch; they are definitely not a secret.

If you do write down your passwords, don't make it obvious which password corresponds to which account. Even better, write the passwords incorrectly and make up an easy rule for fixing them. You could decide to add 1 to each number in your password, so that 2x6Y is written as 3x7Y.

I could pose as a Yahoo rep claiming that there's been some sort of fault, and somebody else is getting your e-mail, and we're going to have to remove your account and reinstall it. So what we'll do is reset the current password that you have - and by the way, what is it?

Choosing a hard-to-guess, but easy-to-remember password is important!