The first-time I was promoted to management, I had no idea what I was doing. Managing people is a totally different skill set to the highly technical positions I had before. So I decided to look into management courses etc. to try to figure it out. I convinced my company to pay for a few graduate level courses.
After a very short time in these courses, it became abundantly clear nobody else had a clue either. They had ideas and "case studies’ but no actual proof of anything. It was all a bunch of bullshit fads to make money.
Over the decades I have come to understand why a good manager is such a unicorn. A good manager has to care about both the people and the business equally. It’s a razor thin balancing act. I have met exactly one person who fits this model.