TIP: Whenever you see a link in an email, 99% of the time you should not click on it. The only exceptions are when you’re expecting a particular email, such as a forum registration link or game account activation email. Things like that.
If you receive a spam email that tries to sell you a particular service or product, never click on any of the links inside. You never know where they’ll lead you. Sometimes they might be safe; other times they’ll bring you straight to the doors of hell and swarm you with malware and viruses.
If you get an email from your bank or any other service (e.g., bill payments), always visit the website manually. No copy and paste. No direct clicking. You’ll thank yourself later.