on Just Publishing Advice:
If you are serious about book marketing and building your author platform, you will probably consider a self-hosted WordPress site.
To get the maximum value from all your posts and pages, you need plugins that will help increase your site traffic and, in turn, your book sales.
At the same time, you need to make sure that your WordPress website is secure.
Here is a list of free WordPress plugins for authors and writers that I use on my sites. All of them are ease of use, functional, practical, and have good support.