WordPress is an online, open source website creation tool written in PHP.
In my opinion, I don’t agree some people said it is the most powerful blogging and website content management system (or CMS) in existence today. I had been working both Blogger and WordPress 10 years ago, it was the reason that WordPress was too difficult to use and I gave up to concentrate using Blogger for my blogging tools, and at least Google provide much easier user-interface too.
Until recently, WordPress was catching my eyes because it has a better integration for a blog tool with online shop, and thus I need to study it as WooCommerce + WordPress solution, the answer is that you need to pay for the theme and plugins to test and measure.
I have paid much tuition fee for testing some themes or plugins solutions that you have to install and see the result, beside you look at the reviews from others, you only know you encounter the error problems and search the answers or solutions online.
WordPress is still a very good choice since it has so many nice themes to create beautiful website, and responsive theme is the most important for the decisions nowadays which many people using mobile to view your website.