Our great sponsors
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Ionic Framework
A powerful cross-platform UI toolkit for building native-quality iOS, Android, and Progressive Web Apps with HTML, CSS, and JavaScript.
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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 believe this may extend well from your experience with HTML, CSS, and JS. It should not be overwhelmingly difficult to pick one of these frameworks and create your app especially since your app idea is a pretty standard one used for tutorials and guides (user registration and data manipulation). Professionally, I use https://ionicframework.com/ for the creation of hybrid apps. Their getting started guides will literally let you get an app running on your phone in 15 minutes.