I think it really depends where you come from, how you learn best and what you want to achieve. It won't hurt to know the basics but if you have fun learning for example some Vue first and that helps you to become a better developer I would go for it.
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As a beginner, don't ever start off with frameworks, go for vanilla JavaScript first.
Yes. I have gone through Vanilla JavaScript. That's the reason I'm proceeding to frameworks now.
I think it really depends where you come from, how you learn best and what you want to achieve. It won't hurt to know the basics but if you have fun learning for example some Vue first and that helps you to become a better developer I would go for it.