Table manners - In addition to elbows off the table and all that, Dad filled his plate first, then passed everything to his right, and we sat in order; oldest to youngest. Dad got the largest piece of meat and the last of the sides, so me and my brothers never took the last of anything without Dad's permission. None of us had the balls to ask.
If we forgot our manners, Dad gave us a rap across the knuckles with the handle of his butter knife. I only experienced that once. We ate everything on our plates, excused ourselves from the table and took our plates, glasses and flatware to the sink to scrape and rinse.
Once in a while, after saying "Please may I be excused from the table?" Dad would bark, "No, you may not!" That meant you had a lecture coming after everyone else was excused wuuun at a time for forever while you tried not to fidget in your chair.
Every adult man was "Sir" and every adult woman was "Ma'am." You could say "'morning, Gramps," but when he asked "Learn anything at school today?" you'd answered "Yes, sir."
I didn't teach my kids manners the same way my Dad taught us, and I only taught them to be courteous and respectful.