it is of imperative decision to put Recaptcha on your self-hosted blog platform otherwise hackers and bots will be easily tried to hack in to your wordpress system. and one of the way to prevent it is by using Recaptcha. Recaptcha is a method that’d make it hard for the hackers to try to login and even commenting by putting a barrier for them to read jumbled letter and words.
at least make them uncomfortable, it is a great way to discourage hackers from accessing your website. you can download the plugin for recaptcha comments here and the login recaptcha here. also get the public and secret key in here. Recaptcha is free of course. 🙂