Summarize:

You'll need to use the "Terminal" app to hide your folder. This is in the top right corner of your screen. You can also hold Command and tap Spacebar. Your folder should now be hidden from view! Hidden folders on a Mac are invisible unless you type a specific command into Terminal.
Two-finger click your desktop. Click New Folder. Type in a name for your folder. Tap Return. Click the magnifying glass icon. Type in "Terminal". Tap Return. Type chflags hidden. Drag your folder into Terminal. Tap Enter.