When polygons are set out on a plane they must not overlap and have no gaps
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Math is a sequential subject. If a person misses a step then there is catch up to do which is not done often. This leaves the student in a hard place with classes rushing on with them left behind. If the teacher does not recognize that the student missed the concept then they are left behind.
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A math concept is how you solve a math problem or the ideas. You usually have to memorize math concepts.
"key concept" is not a mathematical term . A key concept is an important idea. Two key concepts in math are derivatives and integrals of functions. ( "function" is also a key concept.)
There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.