Protecting your Mac with a screensaver password is a good way to make sure your personal data stays private, even when leaving your Mac among friends and colleagues.
We love Keynote — Apple's own presentation software. The application makes it possible to create incredible presentations with very little effort.
So you've learned how to install applications on your Mac. Now for the hard part: uninstalling the applications that you don't need anymore.
If you keep your Mac in a public place like an office or a university, you should definitely add a password to your screensaver. It only takes a minute!