What is OneDrive?
Microsoft OneDrive is a file hosting service and synchronization service operated by Microsoft as part of its web version of Office. Use Onedrive to share, store, and backup files.
To use OneDrive, all you need to do is either drag a file into the window, or select Upload and select either File or Folder.
Onedrive tutorial
Upload and save files and folders to OneDrive
Microsoft support training for onedrive