From the title I was first expecting some kind of educational material, but then I saw the link and knowing that Ghidra itself is for the most part written in J

From the title I was first expecting some kind of educational material, but then I saw the link and knowing that Ghidra itself is for the most part written in Java I thought then that it would be about Java internals used by the debugger portion of Ghidra. Happy to learn that it is indeed educational material as I have only scratched the surface of Ghidra myself and have a lot to learn about it.