Microsoft's Excel, one part of its leading suite of office tools, has a simple-seeming exterior that hides a deep well of tools. Sure, you can put numbers into a spreadsheet with relative ease, but what can you then do with that data?

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If you're in a professional position where you need to take your Excel knowledge further — or if you'd just like to know how to get the most out of the tool — a training course for basic and advanced features is no doubt the answer.

Instead of paying hundreds of dollars for a training course, why not instead pay just $29? Windows Central Digital Offers has a deal right now where you can save 95 percent off the regular price of $690. Yes, you'll pay just $29, and there's even a certificate of completion included.

This two-part course includes 56 lectures and 48 hours of content spread out over two complete courses: Excel and Advanced Excel. Learn tables, graphs, charts, and macros at your own pace, as access once purchased remains open forever.

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Need to kick your Excel skills up a notch? For just $29, you can cover the basics before moving on to advanced topics. Don't wait too long; this deal won't last.