Fortunately, I took metal shop, wood shop and drafting in high school. They should have also taught us how to farm and build things too. I suppose some high schools do. Classes in home ownership, bill paying, doing taxes. Maybe they did teach us that. I can't remember.
Need more than that. Every one of the bosses has really nice personal vehicles and crap that is not road worthy for business ones. When they break down that is an excuse not to work, which leads to getting behind on the schedule, which leads to the job taking way too long and most of the profit flying out the window.
In any business you make your money on how fast you can turn the job and move on to the next profit.
And they pay their people peanuts then seem scared to teach them anything which leads to the boss doing all of the critical work. --slowing the job down more.
The boss of the crew in there now has been in the trades since he was 10 yo yet his business seems to survive only by draw to draw. He should have several crews by now, late 40s, and not be swinging a hammer unless there is some sort of emergency.
Even the GC seems to suffer from that. If the work wasn't so nice I would have sent them all packing 4 months ago.
I am only a DIY level on trades but I do know business, I could have them all solidly in the black and building in less than a year.