Here is a link to do it on Google: https://www.google.com/landing/2step/
Outlook/Hotmail: http://windows.microsoft.com/en-gb/windows/two-step-verification-faq
Yahoo!: https://help.yahoo.com/kb/turn-two-step-verification-sln5013.html
Facebook?: https://www.facebook.com/notes/facebook-engineering/introducing-login-approvals/10150172618258920
Check your password strength here: http://www.passwordmeter.com/ https://howsecureismypassword.net/ https://www.microsoft.com/en-gb/security/pc-security/password-checker.aspx
EDIT: Check out this site to findout if the sites you use also have 2 step verification: https://twofactorauth.org/