I'd like to build an app that I can compile for both Android and Windows, but I also need a WEB version accessible through a browser. What technology / framework would you suggest for this purpose?
There are several options for building an app that can be compiled for both Android and Windows as well as accessible through a browser. Here are a few popular ones:

- React Native: A JavaScript-based framework for building native mobile apps for iOS and Android, it also supports creating a web version of the app that can be deployed to a web server.

- Xamarin: A cross-platform development tool that uses C# as its primary language and can target Android, iOS, and Windows. Xamarin.Forms allows you to create a single codebase for all three platforms.

- Flutter: A UI toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase.

- Electron: A framework for building cross-platform desktop applications with JavaScript, HTML, and CSS. It can also be used to create a web version of the app that runs inside a web browser.

The choice of technology/framework depends on your specific requirements and skill set. If you want to save time, you should probably pick something that looks the simplest/most familiar to you. In case you are completely new to app development, Electron may be a good way start, as its core technologies (JavaScript, HTML and CSS) are widely used around the Web and could be useful in a broad range of projects.
Can you tell me the steps of how I would set up an electron application?