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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Then try to use Next.js to make an app or website!
Both my co-founder and I transitioned from backend to full stack in order to be able to contribute to https://github.com/Uclusion/uclusion_web_ui What we learned is that the best way to learn front end is by doing. And this is confirmed by the fact that twice now front end people that wanted more experience in React or Material UI (cause every Javascript library is its own universe) have contributed to that repo for free.