In no particular order:
-It's very easy to fall into the trap of thinking you're a shitty parent. Of course, you might be. But if you are, would you really care enough to ask yourself such questions. Plus, you see other kids doing "better" or "more" than your kid, as well as the other way around. A good general rule is to do better than your parents did. That's really the only metric for progress you can truly depend on. Don't make their mistakes, your kids try not to make your mistakes.
-I think severity is only necessary when they are very young, and talking through things with them at any age is better than aggression. I have done and experienced both, I think reason rules more often than not with most people. Children especially since they aren't fully inundated with shitty perspective like all us adults. But severity IS very useful at young ages and if done correctly will last into the rest of their lives. So, end up with this deeply rooted fear of making you angry. I don't know if that's "healthy". I do know kids absolutely know when an adult lacks a spine and will not only take advantage of it, but will also lose respect for those adults as well.
-The only thing your kids care about is that you care about them. Money, status, activities, toys, books, movies, tablets, etc. This is all well and good, but they won't care if you care about them and show it every day. It's easy to see what you're doing wrong, what you do right is almost invisible and it should be. Kids should take it for granted that their parents care more about them than anything else. My son doesn't care if I miss his bday party, or don't celebrate Christmas, or shit like that because he knows I give a damn. Maybe that'll change as he becomes a teen, but I doubt it.
-Touch is very, very important and solves a lot of problems. When my son acts up at school, much more rare these days, I want to tell his teachers to just put a hand on him to get his attention. Make sure he looks at your eyes, and tell him to get his shit together. Sometimes, if spanking accomplished nothing, I would call him or his brother over severely, tell them I love them and give them a hug, and POOF problem disappears.
-I have been making fantastical claims to my son since he was old enough to understand claims of any kind. "We are actually lizard people and we wear these skins to blend in." "Cats are made of jellybeans." "I am going to buy 30,000lbs of candy and make an army of cats." Shit like that. Now he doesn't believe a word I say and recognizes my joking voice. He is skeptical AF.
-The worst possible punishment a toddler can face is being put in one spot and not allowed to move. A chair works real well, so does a small rug. They hate so much.