Where to go from here?

What now?

If this material was a bit overwhelming for you, I'd suggest taking a step back and reading The Rust Programming Language. Or at least, the first 10 chapters.

Next, you may be interested in looking at existing plugins for inspiration. There's a nice list of them in the official user guide: https://docs.pola.rs/user-guide/expressions/plugins/.

Finally, you should definitely join the Discord Server, where there's a channel dedicated to plugins: https://discord.gg/4UfP5cfBE7.