
Sounds silly, but once upon a time I accidentally left my MacBook Pro at the TSA checkpoint on my way to my flight. This way if you lose it, or it's stolen or someone tries to access it when you're not looking, they can't just get in and have immediate access to all of your info.

While this may be less of an issue for a desktop Mac in your home, I highly recommend that you turn OFF the automatic login on any MacBook notebook. When you first set up your Mac and create a user account by default that user account is set to automatically log you in each time you boot up or wake up from sleep. I'm a MacBook Pro user in case you were wondering. These tips are for all "MacBook" users despite your particular model. I'm doing that to keep from having to write MacBook/MacBook Pro, MacBook Air every single time.

First off I'll use the word "MacBook" throughout this post.
