Two-factor authentication is a way to ensure that your online accounts are extra secure by requiring you to authenticate yourself using two different sources. Common examples of two-factor authentication include one-time passwords that are sent to your phone or email, and physical token generators.

Here is a list of steps to ensure your accounts are as secure as possible:

1. Enable two-factor authentication for your online accounts when available.
2. Choose strong passwords that are difficult for others to guess.
3. Regularly update your passwords for security.
4. Do not share your passwords with others.
5. Avoid using public networks or computers for accessing your accounts.