Passwords: Always try and choose long and strong passwords, these can be a combination of three random words and should include numbers or symbols for extra strength.
Always use a long and strong separate password for your email account.
Security questions: Try and choose a mix of questions that you think will be difficult for another person to guess the answers.
Logging out: Once you have finished a session, always remember to log out of any accounts which you have signed in to and ensure that any shared computer is not left unattended at any time.
Extra layers: If MFA (multi factor authentication) is available, use this as it provides defence in depth for your accounts. For example, your banking app may SMS you a unique code for each login.
Stay vigilant: Check that your software is up to date and use internet security software. Always have Anti-virus software enabled and updated.