Earlier quoted context omitted.
This advice and the advice of the parent are both very useful, in my experiences. One thing I would add is to make sure you love working for your boss. If you don't love working for your boss, get a new boss.
This. So much this. The actual work, while important, is of less importance than your manager. Yes, find interesting work, but prioritize them, and consider outright declining them, if the manager does not seem like someone you can work with and can trust to be dealt fairly by.
But you're at such a disadvantage when interviewing -- how do you vet your potential manager? And when your financial welfare is on the line, would you really pass up an opportunity on this count alone?