My father is 80+, and as it turns out a former Maths teacher in secondary schools and subsequently Wellington Polytechnic. Just prior to taking up teaching I asked for advice on what Dad considered was most important about teaching.
In summary his advice…. As it is now, and as it was 50 years ago, good relationships with students are essential. This does not mean “friends” or “being liked” but maintaining a good professional relationship to enhance learning.
The more things change the more things stay the same.