Hot of the press, Sitecore has released the "Getting Started with Content Hub ONE" course on their learning platform. Be sure to check out learning.sitecore.com.
About this course:
Get started with Sitecore Content Hub ONE the right way to quickly structure and create reusable content that can be easily deployed across all channels. This learning path includes training for Content Authors and Content Modelers on how to create, manage, and publish reusable omnichannel content. Additionally, this path covers how Developers differentiate between and request API keys for rest, delivery, preview, and media APIs to deliver end-user experiences. (source learning.sitecore.com)
Let me know what you think about it!