The answer is main points. Milady's note-taking guidance states this directly: use key words or phrases to identify main points.
It appears alongside related classroom study tips — listening carefully to lesson introductions and summaries, and writing complete, accurate sentences whenever an instructor signals "you need to know" something. The book ties key words specifically to spotting main points, not to problem-solving or task lists.
Milady Standard Barbering, 6th ed., Ch. 2 (Life Skills), p. 34: "Use key words or phrases to identify main points."
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More real Life Skills questions with sourced answers: What Should Professionals Do Instead of Reacting, Which Vitamin Is Important for Skin and Tissue Repair, What Is Called Retailing in a Barbershop, Which Exam Questions Should You Answer First, and 17 more on the Life Skills practice questions page.
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