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Microsoft Excel is free to use, with limitations. For the cost of a Microsoft 365 subscription, you get a whole lot of power.

Udemy is an online learning platform where you can access ... However, if you already have a decent amount of experience with Excel then feel free to try your hand with the more advanced courses.

TL;DR: A wide range of Microsoft Excel courses are available to take for free on Udemy ... or simply learn something new.