You do not say whether you want to transfer just the database or the database and all of its associated resources (e.g. media). In the latter case (transferring a database + all its associated resources), the information at the thread below might be of interest. While referencing WinOS<->macOS specifically, the steps also assure that file paths to the resources are properly defined before your relative starts working with any associated resource file(s) that you might care to provide.
In all cases, creating a ZIP archive of the file(s) that should be transferred will provide a more secure (and more cleanly organized) transfer format than transferring just the raw database and resourse files/folders.
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JJW