While we now know a lot about teaching, a lot of misconceptions have been found recently regarding “truths” about teaching, its a fascinating subject really, and the main problem seems to be lack of rigorous repeatable double blind testing for all of those things.
I happen to work in academic research. Let me just say that research in 'soft science', i.e. that which uses statistics to 'prove' things does very little to convince me. I'd trust a senior pro over the last shiny study anytime, precisely because I happen to produce such studies.
Veritasium did a very interesting video on the subject: https://youtu.be/rhgwIhB58PA