On our Curio website I recently posted a Curio 8 overview video that gives a quick 10-minute tour of Curio and some of its major features.
Next to the video you'll also find an HTML and PDF export of the Getting Started project that comes bundled with Curio. Both exports are great ways to see what you can do using Curio.
Separately, you can also read the complete Curio User Manual if you'd like to check out all the features in detail.