To be clear, you probably shouldn't do machine learning in Excel. As one Reddit comment said, it's like learning to drive in a Model-T. But still, if you're comfortable with Excel, why not? This article summarizes a book describing machine learning in Excel, and where there are bits and pieces in columns elsewhere (I searched), you'd probably want to pay the 30 Euros at APress (their "dedicated site for Canada" leads to the U.S. site, which is more of an insult than a convenience). That's a far sight cheaper than the $2795 course (delivered virtually) from Global Knowledge and a little cheaper than the $10/month for a bundle from Packt, but not as cheap as Microsoft's own documentation, which is free.