Our great sponsors
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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.
You might also be interested in looking into building a set of flashcards using Anki (https://apps.ankiweb.net/). It's opensource software that uses spaced repetition to ensure you remember the content well (basically, you start off reviewing all the flashcards, if you get one wrong you'll be tested on it sooner, if you get it right you'll be tested later, and so on and so on until the content is in your long-term memory). You can download the app to your phone or use on a computer