Imagine a beginner opens a notebook and the first cell loads a dataset, then shows the first few rows. That is already doing something valuable. It turns the dataset from an abstract file into visible examples.
This first step matters because it grounds the learner in the actual data before anything more complicated happens. The notebook is not impressive because it has cells. It is useful because it encourages small, inspectable steps.
A healthy notebook workflow usually begins by making the current state visible.