WP/Anspress Theme firewall/security plugin

Hello, I use the anspress theme and am looking for a cost effective security/firewall software for a discussion forum.  I currently use Sitelock but they are too expensive and they merely repackage / resell I think Sucuri

Can someone recommend a security plugin that is not too too technical to use and relatively low overhead to maintain and deals with most issues.

Yoast wrote a good article https://yoast.com/wordpress-security/

So did Elegant Themes https://goo.gl/P9T8CK

There are many choices.  Need input.

Thank you.