I see that there is hundreds upon hundreds of RESOURCES online saying that "you cannot code programs with a hex editor."

And yet, in my garage, I have a computer which can ONLY be programmed in hex - its keyboard consists of 25 buttons {0-9, A-F, Goto, Exe, and a couple of other commands)

SO WHY ARE THEY SAYING ITS IMPOSSIBLE?

And as it is not impossible, where do I go to learn where to code it?I don't have direct expertise to answer your QUESTION, but I'm guessing that it's not so much that it's impossible, it's just that most people don't code at that level, anymore. (I've hard stories from the old days that there were guys good enough to key "hex" and "octal" and "ascii" DIRECTLY into the computers -- no punch CARDS, no tape.

I did a search, and found THIS.coding in Hexadecimal is really just coding directly in machine language. in order to learn it, you'll need to learn the instruction set of your target processor. Then, when you're done, you can do it again! because by the time you make something useful, the processor you originally wrote it for will be obsolete!

I'd like to make a revision to their statement:

"you cannot practically code programs with a hex editor"