Best resource to learn D3.js?

I was wondering what sources you guys recommend learning D3.js ? I can’t seem to find anything for the new version 4.0 and I guess there are something that wont work in 3.0 anymore

It looks like Mike Bostock’s (creator of D3.js) advice is to just read the 4.0 release notes along with the tutorials.

Tutorials may not be up-to-date with the latest version 4.0 of D3; consider reading them alongside the latest release notes, the 4.0 summary, and the 4.0 changes.