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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.
I would suggest you start with a beginner friendly like Python to learn the basic with how it works and once you’re confortable doing if, else, loops, functions, classes then you could see what kind of things you what do develop so you’ll learn a specific language or set of languages with a roadmap (look for " roadmap github", an exemple would be this: https://github.com/adam-golab/react-developer-roadmap), and follow the roadmap with google search, YouTube tutorials, Udemy classes, etc