Learn the language (javascript) not the latest framework. That way whatever the latest framework is when you next get a job you can pick it up easily. That said

Learn the language (javascript) not the latest framework. That way whatever the latest framework is when you next get a job you can pick it up easily. That said though, don't use a framework 'just because', use the right tool for the right job, and 99% of the time the client doesn't know or care what you use, unless they're insisting on the latest buzz word.