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!
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.
Installing applications from the internet can be daunting for first-time Mac users. Don't worry though, it isn't as complicated as it may seem at first sight.
Your Mac is full of settings that will help you configure it to better suit your needs. Just click System Preferences to get started.