Hey George, thanks for coming to the conference! Welcome to the (small) club!
The more languages one has seen, the better. I think that Python experience is especially relevant for us right now, to understanding whatever that sweet spot is that people have found from it. I've used Python, but would be hard-pressed to say what makes it so beloved relative to other options (what can it do that JavaScript isn't likely to do just as well?). In the WASM space I suggested looking at Pyodide for comparison with what we are doing:
https://github.com/iodide-project/pyodide
For getting started with Rebol... Ren-C has a lot of rough edges, especially in the documentation space. There's a work in progress to emulate Rebol2, so there's no harm in learning the better-documented Rebol2/View, if that's where you'd like to get started, maybe working through some tutorials on that:
Chat on StackOverflow is often just me talking to myself 
but pretty much any topic is fair game. All one needs are 20 points, which are easy to get if you ask Rebol questions...which only we read and answer, pretty much:
Again, welcome!