Things to remember when doing business

Once starting to work as a full time employee, I realize how well I was protected by my advisor in school. Now it's time for me to fight on my own.
I hope I can go through the hard time and gradually grow up. So that, one day I can provide protections to others.
My first supervisor is very nice. He taught me several things:

1. Don't be afraid of making decisions and taking responsibilities.
2. Let each figure tells its story. If the figure couldn't deliver enough information, edit it or delete it.
3. Put yourself in clients' shoes.
4. Treat your email communication as equally important as your oral communication. The customers appreciate a reply from their email messages - it's good business protocol.
5. Don't neglect details.
6. Technique writing skill is one of the most important skills in work.
7. COMMUNICATION! COMMUNICATION!!! COMMUNICATION!!! fully understand and keep tracking
• your and the other parties' responsibilities
• customers' needs/expectations
• any problems/issues that need actions
8. Always remember your goals. Communication, negotiation, .... everything is for reaching your goals. Being nice, being tough, .... any attitude is for reaching your goals!!
9. Don't be afraid for facing the aggressive people. They need to reach their goals but so as you. Don't be distracted by their personality or attitude. Focus on your goals. 
10. Don't cry on split milk. clean up the mess and move on. Keep looking to the future.