See and organise your files in the Finder on Mac
The Finder is the home base for your Mac. The Finder icon looks like a blue smiling face; click the icon in the Dock to open a Finder window.
You use Finder windows to organise and access almost everything on your Mac.
See your stuff
Click items in the Finder sidebar to see your files, apps, downloads, and more. To make the sidebar even more useful, customise it. To make the Finder window even more useful, show the Preview pane.
Or, ask Siri to help you find what you want.
Ask Siri. Say something like:
“Show me all the files called Expenses”
“Open the presentation I created last night”
“Show me files tagged ‘conference’”
“Search for files that Jason sent last week”
Access everything, everywhere
Use iCloud Drive to automatically store your Desktop and Documents files and folders in iCloud. You can access them on any Mac where you’re signed in with the same Apple ID.
Organise with folders or tags
If you like organising your files in folders, you can do that. It’s easy to create new folders in your Documents folder, on the desktop or in iCloud Drive.
You can also tag files and folders with helpful keywords to make them easier to find.
Keep your messy desktop clean
Stacks helps you keep files organised in tidy groups on the desktop. You can group stacks by kind, date or tags. When you group by kind, all your images go in one stack, presentations in another, and so on. Any new files you add go immediately to the correct stack — helping you keep everything in order automatically.
Choose your view
You can choose how you view the items in Finder windows. For example, you don’t have to view your items in a list — Gallery view lets you flip through your files and folders visually.
Send it with AirDrop
You can send a file to a nearby iOS device or Mac right from the Finder. Click AirDrop in the sidebar to get started. See Use AirDrop to send files to devices near you.
You can also select a file in the Finder, then click the Share button 
(or use the Touch Bar) to share it using Mail, AirDrop, Messages, Notes, and more.