For Jovo3 you provided tutorials and examples, including downloadable copies as templates (eg https://github.com/jovotech/jovo-templates).
If there are direct 1:1 equivalents for Jovo4, I haven’t found them yet.
It would be TREMENDOUSLY helpful/reassuring to see side-by-side comparison implementations. And I presume you would like to see my sample ported to idiomatic v4, since it seems to be one of the larger Jovo examples publicly available.
Seriously, if you want us to follow you to v4, you really need to make doing so easier.