Apple Mac mini (Late 2014) - Manual (Page 6)

Get to know your desktop
The desktop is where you can find everything and do anything on your Mac.
The Dock at the bottom of the screen is a place to keep the apps you use
most. It’s also where you can open System Preferences, which lets you
customize your desktop and other settings. Click the Finder icon to get to all
your files and folders.
The menu bar at the top has useful information about your Mac. To check
the status of your wireless Internet connection, click the Wi-Fi icon. Your Mac
automatically connects to the network you chose during setup. You can also
find anything on your Mac and look up information using Spotlight.
Help
menu Menu
bar Finder Dock System
Preferences Spotlight Wi-Fi