I was just wondering what the recommended method of transporting my macbook is? If I am going to use it at home connected to charger and then take it to class to use on battery, should I fully shut it down and start it back up when I get to class? Or should I just close the lid? Does closing the lid put the computer to sleep or just shut the display off? Also what about if I am taking the computer to use at the office where I will charge it? Thanks for your help.