There are countless blogs. Some of us are earning money and some do not. Many of the bloggers use WordPress at the moment. You need to make certain that your blog is secure.
By default, the latest version of WordPress is pretty secure. The development team of WordPress has considered anything that might have been added to any how to fix hacked wordpress plugins. Before, WordPress did have holes but now most of them are filled up.
Use strong passwords - Do your best to use a strong password, alpha-numeric, with upper and lower case and special characters. Easy to remember passwords are easy to guess!
Keeping your WordPress site up-to-date is one of the easiest things you can do. For the past couple of versions, the ability to set up automatic updates has been included by WordPress. A new upgrade becomes available.
As I (our fictitious Joe the Hacker) understand, people have way websites too many usernames and passwords to remember. You have got Twitter, Facebook, your online banking, LinkedIn, two blog logins, FTP, internet hosting, etc. accounts that all come with logins and passwords you will need to remember.
Do not use wp_. Web hosting providers are currently removing that default but if yours doesn't, adjust wp_ to anything else but that.