This is a simple tip for Mac users.
New Macs ship with a clean desktop, meaning you won't see icons for the computer's main drive, external drives plugged into the USB port, or network drives and so on. This can also be the case if you just upgraded your old Mac to the latest version of Mac OS. Without these icons, browsing for files stored on these drives or network locations can be annoyingly difficult. Here's how to quickly get those icons back onto the desktop.
Click on the desktop, this will invoke Finder (meaning you're working with Finder directly). Now use the Command and comma keys: press and hold the Command key then press on the , key. This brings up Finder's preferences. (Alternatively, you can also click on Finder at the top left corner of the screen then choose Preferences). On the General tab, which is the very first tab, check the boxes of the types of drives (Hard drive, External disks, DVD or network drives) you want to be shown on the desktop. That's it!