Some Do's and Don'ts of life (purely based on personal experiences):

• Don't give too much importance to friends. They are the ones who hurt the most at ANY given point of time(knowingly unknowingly I don't know).
• Keep your expectations under control. Don't have too many of them. ;)
• Don't take too much tension. Whatever has to happen will happen. Nothing can stop it.
  
• Respect parents. No one can substitute them.
• Love yourself. Only then you can expect others to love you (well hasn't happened till now but still trying) ;)
• Do not let your self to be an option for some one. Try to be the one and only one. :)
• Have a control on your speech. You never know who can use what you said to harm you later.
• Do not tell everyone everything about your life. (Remember my blog on 'Learn it the hard way?')
• Be true to yourself. That helps a lot. You will come to your own rescue some time. :)

....will continue if I can think of anything to add to the list