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Actually Forth is no programming language, it is a mixture of operating system, frontend for human interaction with computers, and among others provides a way to program computers.
There are many forth dialects. My first touchpoint to forth was a high-level dialect: Factor[1]. To get a better understanding in forth I started to study the "real forth". Best introduction is probably Leo Brodies "Starting FORTH"[2].
From my point of view, you'll never understand forth fully, without having a look how a forth-system is implented. A very good starting point is "jonesforth"([3] and [4]).
As mentioned above, forth is a whole operating system, something like jonesforth you could run on a bare-metal machine, without any other operating system.
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