> Instead, pick a book or a course that teaches ~100 well represented problems. And don't pick a book or course that has only problems. Pick something that teaches you to think about them.

The site doesn't actually list any books or courses that do this. It just states that bouncing around is bad in https://leetcodetherapy.com/interview-prep-today, but it gives no specifics for the right way of doing it. Maybe the reason that guy is bouncing around is that there IS no resource that steps through "100 well represented problems."