It seems they’re not far from finishing and have the first few chapters up for early access and feedback. It could be the go to text for learning the protocol.
Publish date of September 2024, according to that link.
I wonder if the reading clubs will be ready to transition over to it or if that'll still be too early.
Either way, I'm kinda hyped that O'Reilly will be publishing something centered on ActivityPub. It's hard to find in-depth resources on it that aren't hyper-specific to one implementation and/or use-case.
The protocol is mostly a separate topic from basic rust fluency, I’d say. For instance, the reading clubs could maybe start looking at the lemmy ActivityPub crate in not too long a time. So I’d imagine we could start reading it by then if we wanted to. Thinking about basic protocol tasks might be a good topic to on ramp into the lemmy code base while still exercising rust muscles.