Once you learn one front-end framework, you're halfway there to learning any of them. There's a lot of shared ideas and concepts among the most popular choices

Once you learn one front-end framework, you're halfway there to learning any of them. There's a lot of shared ideas and concepts among the most popular choices. So it's much faster for, say, an Angular Dev to get productive with Vue.js than it would with a vanilla JS developer doing the same thing.