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People say that "we should have our basics clear and we should have conceptual clearity" in any particular topic, what is the meaning of "conceptual clearity"?

What do topper mean when they say that you should have "conceptual clearity"?
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  1. I know bubble sort algorithm but cant say whats the output of the algorithm after second iteration.
  2. I know to calculate the number of tag bits but dont know why it is used
  3. I know answer to this is “A” because my teacher has told so

These are some examples of not having conceptual clarity. The first one is an example of byhearting algorithm without even understanding what it is doing. Those who do this typically scores less than 30 or 40 in GATE. Second one is more common among GATE aspirants. Not going behind “why”. Such people might score 40+ or even 50+ but probably wont go beyond 60. Those who does the third – needs all the luck in the world even to go above 20. 

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