I also advise my younger readers who come out of school or university to first work in a successful company in order to learn the ins-and-out of an industry. And while working for a company, it is important to make the best out of it either by joining or by forming a “fake family.”
Some of your colleagues will be close friends for life even if you work somewhere else, while others will become your customers or will be in a position to help you in many different ways (the Goldman Sachs people seem to be very good in this respect).
In fact, whereas my life improved after starting my own business (although I worked harder than when I was an employee), the one and only thing that I occasionally miss working on my own is the daily interaction with colleagues or as Kellaway puts it, working and living within a “fake family.