Choose a specialty
A good piece of advice I received in my first job - the sooner you develop a specialty, the more valuable you'll appear to employers. This was coming from a former McKinsey principal, who had deep industry expertise - in the public utilities industry.
As a young person in my first job, I thought it was advice to rationalize working in a boring industry (my naive viewpoint). Looking back, it's advice that I give quite frequently. Your specialty can be industry or function, but the sooner you start building it, the better.
