Nowadays, the security of WordPress websites is more important. Facebook, Google is also taking security seriously, and they have added two-step authentication for users.
The good news is that now you can add a 2step verification to your WordPress site, and it is FREE. I have created a video tutorial for it. In this tutorial, you will learn how to install a two-factor plugin and setup of plugin. You will able to use an email method and one-time use of backup codes.