Please note:  Support for the old OneDrive for Business sync app with SharePoint Online has ended. If you see the OneDrive for business old icon in your taskbar, read this Microsoft article to learn more. 

Sync SharePoint files and folders: This Microsoft article provides video and written instructions for syncing your files and folders with your computer. With Sync turned on, you can work with your files directly from your computer's file system. Directions are provided for both Windows and Mac operating systems. 

Sync SharePoint and Teams files with your computer: This Microsoft article provides written instructions for syncing your Microsoft SharePoint and Teams files to a folder on your computer and changing Sync settings.