This document provides an introduction to using document libraries in Microsoft SharePoint to share files. It discusses the benefits of document libraries over email or network folders for sharing files. It explains how to add, edit, and upload files to a document library from Microsoft Office applications. It also addresses what happens when multiple people try to edit a file simultaneously and how to prevent file locking issues through proper file management practices like checking files out and closing them when finished. The document is presented as a training course divided into lessons and includes practice questions.