Adobe I/O Runtime is built on top of Apache OpenWhisk. This is why many of the resources written for Apache OpenWhisk apply to Adobe I/O Runtime, too: blogs, documentation and references, and so forth.
For a starter, a good resource to check is the Apache OpenWhisk repository.
You can follow up our team on Twitter, Medium, and Youtube.
If you have issues with Adobe I/O Runtime, you can use our Adobe I/O Runtime Forum.
If you have issues with the documentation, you can always submit a pull request.
Check the FAQ for some of the most common questions.