I'll frame the answer a bit personally and say this is advice I would send back in time to my 30-YO self:
- Seek wholeness and health in the spiritual, emotional and physical aspects of your life. This is different for each person.
- You did not have a perfect childhood (no one did). Do some digging, deep work, find blind spots, seek to heal so that you're more likely to have better relationships on the personal side and in your professional life.
- Seek and find your true identity. You are not what you do professionally.
- Don't fall into the trap that you have to work like a machine until you're 67 or so. The retirement age came from an actuarial table. Saving aggressively, combined with time, compound interest and diversification can allow financial independence very early. Then, you can be very selective on what you choose to work on and pursue things of real passion. If you have a large family and other long term expenses, this can be more challenging.
- Pick a career, if you can, that is centered on passion and connection to What you (and the product or service) and the Who (people you work with). Focus less so on compensation.
- Seek meaningful relationships. People that will call you when there are dark days, not the ones that withdrawal in difficult times or send a Facebook reminded Happy Birthday once a year.
- True joy comes from being generous and helping others.
- Oh, and don't drink awful beer! Brew what you like, explore, enjoy the process, invite others to participate.