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I don't have a degree. I've found that I learn better if I write this site than burning myself over grades and exams. I was enrolled at a very large university pursuing a degree in applied sciences but it didn't work after long years and a ridiculous quantity of failures. I took the conscious decision to not care about grades or exams, but to care about the applications in life instead. I'd say that way over 50% of all students at university are so much worried with the credits and the grades that learning is left behind. Every semester the same question repeats. Students ask to each other "Professor A is going to teach subject X. Is he/she good? Is he/she friendly? Is he/she rigorous?". See? Almost all students are worried not about learning, but whether they are going to have a hard | easy time with professor A or B. There is also a matter regarding being a scientist vs. being a teacher and not everyone excel at both.

There is something about asking questions that I noticed in some classes. There are questions that people make that the teacher answers with "What?" or "What you are asking doesn't make sense". When a question doesn't make sense for the teacher it means that you are probably not understanding some concept and the question really doesn't make sense from the point of view of someone who understands that concept. For example: is the tangent function continuous? Because tangent of the right angle doesn't exist. Yes, the tangent of 90° yields a vertical line which extends to infinity. However, the right angle is not part of the domain of said function. When we plot the graph of tan(x) we don't consider the right angle.

When reading the solution for an exercise, try to understand what you were missing or what you were doing wrong. Just reading and then copying it won't make you really learn it. Some authors like to leave proofs to the reader, which is often annoying for some people because they were expecting the author to do it. If you are going to do the proof don't overdo it, they aren't meant to be burdens.

Once upon a time I was talking to a teacher, after he finished giving a calculus lecture, about my struggle with functions. I don't remember what about functions I was talking about. But I remember that he told me that some mathematicians go very deep into functions. They go deeper and deeper, losing themselves and losing the sight of the real world somewhat. As if they "drowned" in mathematics itself and lost the connection with reality. It's rather odd that some teachers do make lots of mistakes during classes and many of them are related to algebraic properties that people often go wrong in exams. I've lost count of how many times I witnessed a teacher erase everything on the blackboard because there was a mistake in a sign here or a misnamed variable there.