If you are using create-react-app, Jest is now included by default. Dodds created a ton of videos on that will help you get started with Jest.
Jest 16 features a new reporter interface that shows running tests as well as a live summary and a progress bar based on the estimated test runtime from previous test runs.
The most opinionated article that resonated with the Jest team was “Testing with Jest Snapshots: First Impressions”.
Ben makes three great points in his blog post: We highly recommend reading the entire blog post.
Over the last month lots of articles were written about Jest's snapshot testing feature, how to migrate to Jest and how to get started writing tests.
I also did a few live videos to explain how Jest and snapshot testing works: A number of people wrote articles about snapshot testing.