Even Apple computers are not invincible.
Here are useful links for help.
Official Apple – Find Out How – Mac Basics:
http://www.apple.com/support/macbasics/
Official Apple Mac Basics video tutorials:
http://support.apple.com/videos/#macos
Calibrate new battery. Old battery life is short? try to calibrate it:
http://santafemacrepair.com/files/battery.pdf
reset SMC + PRAM for various issues:
http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US
http://support.apple.com/kb/HT1379
Apple simple trouble shooting guide:
https://getsupport.apple.com