Learn by example. Check out sample SharePoint Framework client-side web parts connected to the Office Graph published by SharePoint Patterns and Practices.
Here are the presentation slides that I used in my recent presentation about building solutions on the SharePoint Framework at the recent SPS Brussels.
At the recent TechDays NL 2016 I had the pleasure of presenting three sessions about developing on the Office platform. Here are the slides I used.
Recently Microsoft announced the public CDN capability on Office 365. See how to use it to host your SharePoint Framework client-side web parts.
Learn by example: sample SharePoint Framework client-side web parts illustrating SharePoint CRUD operations published by SharePoint Patterns and Practices.