You can access Excel tutorials through the ACC subscription to Learning Express Library. Note: Learning Express (and not ACC) requires that you register for a free account before accessing.
Computerworld has some excellent help for using Excel. Excel 2016 Cheat Sheet by Preston Gralla, Contributing Editor, Computerworld, MAR 29, 2018 10:16 AM PT
Here is the table of contents.
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Install a copy of Microsoft Office 365 on your home computer or personal device!
Download instructions can be found here.