It's just something yo have to do and gain familiarity. Nobody can tell you exactly when to harvest. you have to learn that preference. There are generalization that can help, but in the end you have to rely on how the psychoactive cocktail that results impacts your brain... just as nyquil makes some people drowsy and others energetic. You may feel something slightly different than the next person. You can cut some off early, middle and late to shorten up the learning curve a bit.. or just try harvests of each crop at a slightly different point.
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Nobody can teach you. You just have to do and figure it out. You had a similar question 11 days ago. If you keep worrying about what others think, you might miss the window. Pictures don't tell the story as well as you standing in front of your plants with a scope.