I understand that the best course is one that occurs in their questions and curiosity in students learning. The course teaches theories and recognized from studies. The course makes them think and exercise their knowledge, leading them to practice. And the course that finally makes them reflect on practice undertaken by them and by other professionals.
For all this, I argue that those who have more chance to teach "these best courses" are teachers who have teaching and professional experience. And they understand and properly apply the tools for each phase of the teaching-learning process.
I really feel a little bit confused with your question. However, I will try to answer using "what if" approach.
If you mean who teaches the best courses, then I can say an instructor who is a professional practitioner, who is good in teaching as well as in research. This person will be able to convey the right message in its different approaches.
If you mean the best course to teach is the "teaching course". Then I can say that the teaching course is a course with a clear message and clear outcomes using the appropriate outcome assessment tools. Yes, I agree that it is the best to be taught.
At times I have had students write in an evaluation of my courses, "This is the best course that I have ever taken." What does this mean? It usually comes with no explanation. The best I can guess is that the subject matter somehow rang a bell in the student´s soul and intelligence, and that somewhere down the road he will apply one or two of my lessons to everyday life. But what a puzzle! This question poses another problem that I can´t answer.
Proficient teachers with lots of experience who accept advice from both colleagues and their students! Such feedback is crucial for quality teaching and its improvement!
I start from your "Who teaching the best courses?". I thing the best teacher is the one with a talent! The others who are not talented teachers they should know that, in teaching a subject one has to know the history of its conceptual development, a deep technical knowledge of the subject, and first give examples, intuitions and then technical details. In mathematics the problem is more serious, since the algebraization of mathematics, make geometrical intuition difficult. Thus the best teaching is the one which is the synthesis of the dialectics of "Logic vs. Geometry".
The teachers who were implementing technology based lessons agreed that it was having a very positive effect on student learning and motivation when compared to lessons in which technology was not used.
The question reads “what does it mean to say that the teaching course is the best?” “BEST” is a very strong word and therefore, when a curriculum is judged to be the best, the first conclusion is that the course content exactly matches with the requirement of the student (reviewer) and also (s)he could understand all most all the topics included in the curriculum. Evaluation of the teacher’s performance and his/her acceptability may also be the pre-requisite for obtaining the “best” qualification. Though an absolute attribute like “best” can never be assigned unless an exhaustive knowledge about all the courses related to the subject under consideration is available, such expression about a teaching course is quite common and therefore the supremacy judgment is very much dependent on the evaluator’s background.
According to me, the best teaching course is that in which the students take interest , which includes balanced amount of theoretical and practical content and which is helpful for them in facing and solving daily life problems and situations.
When we talk of a teaching course we are talking of two people - student and teacher; and two needs/attributes - the need to acquire knowledge and the ability to impart knowledge. As Anup Bandopadyay said above, the students' need must guide the formulation of curriculum. It must also meet the expectations of the market, be it that of academics or the job market.
The quality of the teacher is always a critical element and it is my opinion that the qualifications of the teacher are not the only criteria. There are outstanding researchers who are so highly endowed that they cannot teach simple fundamentals to the class. On the other hand, there are teachers who can make fundamentals clear as the blue sky to the class, but have very little research to show off. Among the students also we find that there are some with outstanding academic credentials (in terms of marks) but are not exactly original in their thinking and there are students with average 'marks' but possess outstanding originality in thinking.
Keeping all these extremes in mind, teaching course would be 'best' when the teachers' ability matches the expectations of students and the curriculum is within the capacity of the teacher to deliver and the student to absorb.
Sincerely, after teaching 37 years to more than 2000 students and over 10,000 continuous hours of lessons with the same point of view that had early in my career:
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I do not know yet what is most appropriate for students.
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However I have only one sure, I done my best!
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What I said is not demagogy, but knowing what is the best course for the students is the anguish of everyone who considers himself a teacher.