Disclaimer: I'm not a developer and could only ever be considered a novice programmer. A family member was after a bespoke app that would do some calculations

Disclaimer: I'm not a developer and could only ever be considered a novice programmer. A family member was after a bespoke app that would do some calculations for him on site and include pictures and customer details. They wanted it to work on mobile and desktop. At this point I thought a web or hybrid app would be the way to go. One code base multiple platforms. Cue a month of trying to work out what to use out of an uncountable number of frameworks. I can't overstate the level of confusion involved it this for a novice like myself! I've created a few simple desktop programs before but nothing on mobile or the web. Where do you start with the current state of things on the web? I still don't know. What I did know was I didn't want to waste time learning a framework that wasn't going to be around, or had just appeared. At this point I heard of Dart and Flutter which worked across all the platforms I was interested. Not only the it was JIT or AOT when needed, with hot reload. As for the app, I don't have a GitHub, it's so bespoke to its usecase I don't think anyone would be interested. But also I'd be very embarrassed to release the code. I dread to think how bad it would look to real programmers/developers!