I think one of the most interesting questions in the Forth universe is how small can its core be? The Forth-eV Wiki’s page on "Minimal Word Set" is a great place to start:In addition to the word set, you can also constrain the total file weight of your core Forth. SmithForth https://dacvs.neocities.org/SF/ David Smith’s SmithForth is another 1,000 byte, hand-written machine code Forth that bootstraps a more complete Forth. "My goal with SmithForth is not to stop writing machine code early, but to start writing Forth early." The included 01-helloworld.f example is 200 lines of well-commented Forth source which starts with making numbers, implements a core of standard Forth words, and then prints "Hello world".