In outlining, you pay attention (after making a decision) to those points that are key (both a theoretical or general argument, and an empirical argument or case study of a particular issue).
As you outline, you select relevant material and develop your understanding of the theoretical points and/or empirical arguments (i.e., what kinds of facts either support or refute a particular point).
It should be noted that when you read some texts, you take more notes than others because they will be useful to you in your future work or are more relevant to the problem you are interested in and/or are more interesting and/or more informative from a theoretical or empirical point of view. You then divide the material you read into those of greater and lesser interest to you for the reasons given above.
We suggest the following method of outlining: divide your notebook into two columns. In the left column you make an outline of the material you are reading, and in the right column (at the same time or later) you make a comparative analysis of the content of this outline with other facts you have previously read about, heard about (in lectures), discussed (in classes - tutorials - or informally), and with your own comments and criticisms of the text you are reading. In other words, you use your notes to construct a cross-reference based on your own thoughts, language, data, and also including your own comments on the statements of others.
The quality of any essay (essay) depends on three interrelated components:
The source material that you are going to use (notes of the literature you have read, lectures, notes of the results of discussions, your own thoughts and accumulated experience on the problem);
the quality of the processing of the available source material (its organization, argumentation, and arguments)
argumentation (how accurately it correlates with the problems raised in your essay).