Everyone (well, geeks like me) likes to get hands on experience using technology. Oracle LiveLabs is designed for just that purpose. There are hundreds of workshops across a variety of topics. You can run these workshops in your own cloud account - and in many cases LiveLabs will provide an environment for you free of charge (it's known as Green Button environments).
We've created a curated list of Autonomous Database workshops that we think are a great way to get started with service. The workshop series is called Get Started with ADB series (https://bit.ly/get-started-with-adb). It includes topics like:
There are a dozen getting started workshhops in all. And, when you find a topic of interest - drill down using the many other LiveLabs that are in the library.
I'm a product manager on the Autonomous Database development team.