Myth: The job is mostly about delivering lessons and grading tests and assignments, so once you’ve done a course once, you can coast forever.
Reality: designing and delivering a lecture is just about the easiest thing in teaching. And also very ineffective teaching, so it’s not done very often.
Myth: School is the same as it was a generation ago, when parents were in school.
Reality: There have been huge shifts in education, with research-supported practices replacing a lot of old, ineffective strategies. The teachers who are “old school” are usually ignoring educational research out of arrogance and/or laziness.