This is a great question. I spent the last ~10 years hopping around jobs, working at both FAANG and small startups, but I never stayed anywhere more than 1-2 years. I also moved around a lot. My biggest mistake was focusing too much on salary, job title, technologies and self-development, and not enough on forming deep relationships with others. That was true even in college where I got good grades, but I rarely went to lectures, study groups or parties.

Now I'm here with a relatively broad network but few deep connections. I don't have anyone I can ask for career advice, have beers with, chat with about work, or discuss for new opportunities. Looking at my resume you'd think I'm "successful" - but it's the opposite. It feels kind of lonely and at times I'm sad.

No matter what you do in life, in the end it's all about people. Don't waste your opportunities to get to know your fellow coworkers/classmates/bosses. Make some friends.

Also, don't burn your bridges. There were times in my career when I sacrificed relationships so that I could move on. For example, leaving a co-founder behind when I no longer believed in the company. Looking back, I was kind of an asshole and too immature to realize it. I wasn't capable to fully empathize with the people around me. I truly regret that now.