Powerful enough to convert your ideas into reality.
Simple enough to be used by anyone.
Find out how to install and configure your CMS on your web hosting platform.
Now you have a working CMS now find out how to make it work for you.
Now that your creative juices are flowing read up on the available modules and how they can do the hard work for you.
Crafting your own complex solution around clearFusionCMS then read up on the API and web services it provides.