A: There are a number of standard steps to take regardless of your email provider:

  1. Use a strong password. The current recommendation is a minimum of 15 characters, in a password that is unique and not used with any other of your websites or services.
  2. Add 2-Factor Authentication. This significantly adds to the difficulty of accessing your account even if your password is compromised.
  3. Never allow anyone else to use your computer without first creating a user account for them.
  4. Install and use a quality antivirus software.

Lastly, as you asked specifically about Yahoo, give some consideration as to why one would continue to do business with a company that was directly responsible for not one, but TWO of the worst cybersecurity breaches in history.