good job, you missed the point

Great job, you've failed to document the point.

Regardless of the level a tutorial is given at, there is information that is missing. A well written tutorial knows its audience and contains all the information for that audience.

Sure, I will grant that someone who doesn't know what a computer is shouldn't be expected to follow a tutorial to install PostgreSQL on a headless linux server with proper security protocols in place.

The issue is more that it's extremely easy to assume someone understands what "primitive file operations" are necessary to accomplish a goal, and fail to describe what it is the user actually has to do.

Just because you understand how to navigate a file structure doesn't necessarily mean you have the domain knowledge necessary to make leaps that are frequently present in tutorials.

You’ve assume your beginner knows that In the Terminal meand open the Terminal application, knows how to open the Terminal, knows that the Terminal uses typed commands, knows that typed commands are followed by Enter, and knows that the text following Terminal are the typed commands to be entered.

The non-garbling threw me off (it wasn't jabbernocks), so assumed some passing familiarity. But even granting that, you can add a few minutes and a few google searches to your complexity budget.