I have taken several Excel courses and learned how to use many excellent functions in Excel that allow me to manipulate data quickly and effectively.  Pivot tables blew my mind!  I recommend New Horizons; their classes helped me immensely, and they send you an electronic manual that you can search if you ever need a reminder on how to use what you've learned.  In addition, there are many free Excel tutorials on Youtube that I have been using to keep my skills sharp while I am job-hunting....

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