While the the best of them offer surprising amounts of flexibility, they also impose stringent enough restrictions to page design that you shouldn't be able to create a really bad looking site using one of these services. Typically you can get a Mysite.servicename.com style-url with no commerce abilities for free from one of these services; you have to pay extra for a better URL and the ability to sell. One issue to consider is that if you eventually outgrow one of these services, it can be hard to export your site to a full scale advanced web hosting like Dreamhost or Hostgator. If you know that's where you are eventually going, it may be better to skip the sitebuilder step.
WordPress.org is the CMS version we’ve referred to throughout this article, and WordPress.com is the WordPress version of a website builder. WordPress.org is more complex to set up, but offers greater scope for customization. WordPress.com is simple to set up, but limited – we’d recommend it for blogs, but not much beyond that. We’ve written a whole article on the difference between the two, so definitely go check that out.
Topic clusters involve changing your website structure to have single “pillar” pages acting as primary hubs of information. From this hub, each subtopic (or cluster) has its own page connected via link. Think of it like spokes on a wheel. Every piece of cluster content connects back to the hub, with the pillar page providing the primary anchor point for navigation.