For proof based homework typically a grader will tell you which step failed with a short note saying why ("this mapping is not well defined", "here is a counter

For proof based homework typically a grader will tell you which step failed with a short note saying why ("this mapping is not well defined", "here is a counterexample", etc) It is cryptic at times bit ultimately developing rigor and intuition is something that in my experience will always involve a certain amount of struggle and confusion that no professor can or should alleviate