I would also recommend "R. G. Loeliger Threaded Interpretive Languages Their Design And Implementation" between these two books the whole beauty of Forth and their implementation should just click.
Forth isn't one of those languages that you _use_. You extend the language from the inside, so you need to know how your Forth is implemented. I'd say it is the only language where users of the language could all recreate the language.
Verdex · 1h ago
Also recommending Thinking Forth
by Leo Brodie. The book feels like it was written in the 2010s but the original publish date was mid 80s.
Do yourself a favor and read a few chapters.
Forth isn't one of those languages that you _use_. You extend the language from the inside, so you need to know how your Forth is implemented. I'd say it is the only language where users of the language could all recreate the language.