There's a lot more than a few paragraphs on the wiki (which is linked right after the setup instructions in the official docs), including ~30 pages about the scripting system alone: https://talon.wiki/unofficial_talon_docs/
> As for Slack, I don't really consider that documentation
I think you should try asking questions on this particular Slack before you write it off and recommend that I do something else. It is my official support channel and I am extremely active and helpful there.
> Having the option to try to figure things out by looking at the code could be very helpful
One thing to try - Talon has good Python type annotation coverage and the type information is shipped with Talon. If you point VSCode at Talon's Python interpreter (at `~/.talon/bin/python` on Linux/Mac or `%appdata%\talon\.venv\scripts\python` on Windows), the language tooling in your editor should then know about Talon's API and types.