When choosing a teacher make sure they have the following qualities:
they live what they teach
they know the subject from their own experience of it
they have a clinical practice if the subject is medical
they can explain difficult questions
they do not get angry with questions
they do not feel threatened by other teachers
These are SOME of the qualities a good teacher should have. A teacher who is confident in their own knowledge is not critical of other teachers or threatened by them.
IF YOU find a good teacher, try out some of these points:
don’t abuse them
don’t exploit them
don’t treat them as an equal (where did you learn from?)
yes, and this is hard, give them a little respect
I am lucky to have had several really good teachers. I have learned a lot from a few very bad teachers - I learned what not to do, how not to behave. But all in all it is better to find a good teacher than to have to figure out what NOT to do rather than what to do.
Good luck !