Registergit-annex is a file synchronization tool designed to simplify the management of large (typically data-oriented) files under version control. Unlike Git, git-annex does not track file contents but rather facilitates the organization of data across multiple locations, both online and offline, enabling the creation of multiple copies for backup and redundancy, ensuring data safety and organization.In the past, we have taught webinars on tools built upon git-annex, such as DataLad. In these tools the core functionality is typically provided by git-annex, so we believe it is crucial to understand how to effectively organize data using git-annex itself, without the distraction of additional features.Personally, I have been utilizing git-annex for several years to manage my extensive collection of archived files across multiple drives stored on a shelf. git-annex provides built-in redundancy, ensuring that each individual repository or drive is aware of the location of all files on other drives, eliminating the need to power them on just to find a file. git-annex also offers online capabilities, allowing file synchronization across multiple filesystems and clusters to help you manage your research data.