[pascalxus]

The so called modern day web frameworks (Vue, React, etc) are needed if you want to get a job and become a hardcore FE developer.

But, if you just want something that will maximize your productivity, you should stick to the basics: HTML, CSS, Javascript and jQuery. It's super easy and will get your web app done much more quickly than anything else. Otherwise, you'll end up in a rabbit-hole spending days just getting your infrastructure set up.