Meh, that stuff is pretty self explanatory. Yes you need practice for interviews, but i got my firstjob at 20 and it's more important to have a good resume to get the interview and apply for jobs that suit your personality. Yeah, my first interview was terrible, but it was for a host position... I suck at small talk, I'm much more matter of fact. Second interview for grocery store clerk, got it because I can be polite, just ~zero small talk. One more interview and got job making CAD drawings that I was slightly underqualified for. Getting a job earlier just builds resume, and you can start saving money. Which is good. I actually kind of wish I did get a job earlier, but by not making me I feel like my parents taught me more. It's not like they gave me more money because I didn't. I just saved Christmas and bday money from grandparents, which I guess not all people get.
My parents are middle of middle class. Encouraged me to get eagle scout and good grades, but ultimately let me make my own decisions. While young we were somewhat poor for our area, or they were just saving really fucking hard but yeah... I lived with my parents into early twenties. It's a good way to save money to be in a better standing once it's affordable. Only mention socioeconomic because they aren't so poor they can't afford to let me eat their food and live in an extra room.
They didn't teach me anything like opening a bank, getting an apartment etc. You just call the people and they tell you what to do. Also, you're kind of forced to do that in college if you're lucky enough to go. As a parent I would be there if they had questions, but for the most part they're on their own figuring that stuff out. It's not rocket science.
Most things in life you have to learn for yourself. If my dad told me smoking dope was stupid, I'd hear it but I'd still do it and would continue until I realized it had a negative impact on my life. I was a "good kid" ,obedient I guess. That's the one part that I most strongly agree with. But being an adult means making your own decisions. I guess if they don't get it, question them about why they did something and its outcomes.
As someone else said,work ethic is important.
"I hear and I forget. I see and I remember. I do and I understand."
I guess I was spoiled/lucky/coddled , my life has been pretty fucking easy. Early on they taught me to be frugal and not spend on useless shit. Humility and all that bullshit. I'd say it's more important to teach how to act because not everyone you meet is nice and then they'll never really understand how to treat people nicely (without being a pushover of course)