Oh.
Well, you've reached the end of the tutorial... And yes, as you can see, it's not finished yet.
We're actively working on new content (and improvement of the existing one).
In the meantime, the best course of action is to peruse the resources in the next section, and experiment by yourself. Well, given that, it may be a good idea to ask around for advice. A lot of the problems and questions you will be encountering have already been solved, so others can—and will!—help you getting started faster.
If you enjoyed the tutorial, please consider contributing, donating to our OpenCollective or simply share the link to this book.