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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.
By forcing yourself to become a maintainer first and contributor second, you will be forced to come up with a workflow that works for your project. You will be forced to think of how other people can contribute. This will give you more insight when making future issues or pull requests in other's projects. My first open-source project is a Discord bot. It's nothing fancy. But by working on it, I'm learning Git, Semantic Versioning, how to open/close/label issues and pull requests.