If you'd like to learn the basics about the ArcGIS API 4 for JavaScript, check out this 1-hour training seminar that Rene Rubalcava and I did last week.
Discover the Next-Generation ArcGIS API 4 for JavaScript
The goals of this session were to help you get started on:
- Designing and developing apps using ArcGIS API 4 for JavaScript with an understanding of the new object model, core components, and programming patterns.
- Visualizing your data in 2D and 3D.
- Building apps that take advantage of web maps, web scenes, and layer items
- Creating rich, responsive web apps featuring a great user experience.