What are your best tips for learning to use an application (programming language, really) like MS Excel? Here are some tips I came up with for my business students. Any advice I should add? 

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- Learn *what* Excel can do, so you know it's there when you need it someday. Explore the menus, experiment, read the docs.
- Know it's there, but can't find it? Know the way Excel organizes its interface: backstage, tabs, ribbon groups, dropdowns, more options menu. Also, keyboard shortcuts, mouse shortcuts, and right-click context menus.
- When all else fails, search intelligently: "site: Microsoft.com" in Google, StackExchange's SuperUser forum. 
- Don't know how to use it? RTFM! Help menu in Excel, documentation on MS sites, function signatures as you type formulas. 
- Trying to build something complex? Break it into pieces and test the pieces separately. 
- Have a working solution? Now ask, is there a better way? (Easier, more elegant, self-documenting.) Can I present my final solution more clearly, cleanly, compactly, beautifully?