Angular.js is so 2014, now it’s React.js that is the new hot and shiny JavaScript framework. If you want to learn where all the fuzz is about, I can recommend the great React.js Introduction for people who know just enough jQuery to get by tutorial.
This is the best beginner tutorial for React I found on the web. It walks you through the steps to build a Tweet Box using React.js. The nice thing is that every feature is first built using jQuery and then recreated using React. This really shows of the advantages that React has to offer.