The ribbon comes with new shortcuts, called Key Tips. Watch this video to learn what they are and how to use them.
Keyboard shortcuts that begin with CTRL will still work in Excel 2010. For example, CTRL+C still copies to the clipboard, and CTRL+V still pastes from the clipboard. Most of the old ALT+ menu shortcuts still work, too.
Note: To find more hands-on training, visit the Office.com training page.