I can vouch for PyQt, it works quite well for what it is. Be aware you might have to dig into the C++ docs if you’re trying to do something non-trivial.

If you like, you can use Qt Creator to build the GUI template, and then basically import into Python and build all the logic.

Assuming the project uses them, yes. Might want to check with the project owner to be sure before jumping in.

I would start with the official documentation/guides. https://handlebarsjs.com/guide/#what-is-handlebars

It’s not overly complicated to learn if you already know some Javascript / HTML / CSS. If you don’t, then maybe look up some tutorials on FreeCodeCamp.

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I would suggest Nim, I had a blast learning it and making a small project. It is not a mainstream language, nor is it a joke language.

https://nim-lang.org/