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.

> there is information that is missing.

What information was missing?

> and fail to describe what it is the user actually has to do.

How is "go to a folder and copy file content" is not such a description?

> doesn't necessarily mean you have the domain knowledge necessary to make leaps that are frequently present in tutorials.

Again, rather than speaking generically, how does this post demonstrate it? What leap is present in "this tutorial" that an average reader would not have the knowledge to make?