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Try MySQL. It is free and worth trying. There are plenty of tutorials for MySQL.
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I always go with Microsoft training to start. Here is a free resource<br />
<a href="https://docs.microsoft.com/en-us/sharepoint/administration/data-sources-supported-in-excel-services-sharepoint-server-2013" rel="ugc">https://docs.microsoft.com/en-us/sharepoint/administration/data-sources-supported-in-excel-services-sharepoint-server-2013</a>
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Jeff McClellan

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I need to learn how to make external data connections in Excel and can't find any great tutorials to lead me through it. &nbsp;Looking for details with examples to understand the various connection protocols that can be used and how to do them.
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I need to learn how to make external data connections in Excel and can't find any great tutorials to lead me through it.  Looking for details with examples to understand the various connection protocols that can be used and how to do them.

Best Training - establishing external data connections Excel

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.