There is a new trend lately. It seems that the web is phasing out jQuery. For example GitHub no longer uses it. Reason?
John Resig created jQuery at a time when browser inconsistencies were a serious epedimic in the wild. But all major browsers are now mostly W3C compliant. Secondly jQuery has grown into a bloated library capable of doing almost everything including ordering Starbucks online. It's true. There's a plugin for that (I'm kidding). However most developers only use it for a very limited set of tasks such as DOM manipulation and AJAX calls.
And lasty there are now a whole host of new API's available for simplifyng tasks like AJAX calls that can now be done with the Fetch API which all major now browsers support.
Now we must ask do we still need to learn jQuery? Absolutely! It is still an essential component of many libraries and frameworks (for example Bootstrap 4) and will continue this way for the foreseeable future because libraries tend to be a turnkey solution for web development thus utilizing a large portion of jQuery's capabilities. A better question one might ask is do I still need that library (or framework)?