Anything you click on could infect your computer. Slow down when opening email. Check the sender and also who the email was sent to, there will aften be clues to whether the email is legitamate or not.
Opening attachments, even Word or Docs can be dangerous.
To check links use:
http://onlinelinkscan.com/https://safeweb.norton.com/https://security.berkeley.edu/resources/phishing/phishing-examples-archive