A common problem I'm having with coding tutorials is the tendency to copy paste example code and gain only a superficial understanding. My version "works" but a month later I won't be able to recreate it from scratch.

Your test-driven approach lends itself to hands-on exercises where you introduce the pre-written test cases, explain the new concepts on generic examples, and the person completing the tutorial needs to write the code that gets the test case to pass (or maybe expand a partial solution from you).

Once you struggled with the compiler errors, the trial and failure, the syntax, etc. and passed the tests you will gain operational knowledge that will last a lifetime.

Also, a chapter zero could be made available for the absolute beginners, detailing how to assemble a free Go environment, for example VS Code + go plugin + golang package + Git SCM + delve debugger. That should get most people running in 10 minutes with a very rich and productive environment.