Is this table in 1NF?
In the site that you have cited, note the parentheses at the right of the attributes in the second part of the initial column:



There is no context in the picture, but the obvious interpretation of such parentheses is that they denote repeated attributes: in other words, for each course (for which there is only one tutor), there are multiple students. So the notation (actually not very clear) should denote a non-flat situation, in which the 5 attributes are repeated.

This is clearly not a relation (or a "table" in 1NF), and the first step in the normalization is to divide these data in two different tables, one for courses and one for students, and of course add to each row of the second table,  which should represent a student, a foreign key towards the course to relate that particular student to a particular course.

Related Q &amp; A on Computer Science SE: Does 2NF require 1NF?