Speaking of more work than you bargained for, don’t forget that your readers fall into the same category. I’m sure I’m not the only one who’s ended up reworking a number of spreadsheets upon learning that one new technique that makes it all the better / faster / more foolproof, etc…

The day I learned that sumif was much faster than vlookup I spent a full day reworking my files, but it dropped the recalc time on my budget analysis by over 90% (having quit the job two weeks later, though, that was a time investment I did not recoup). Even the simplest tip can be a huge payoff to someone.

Newbie or advanced, there’s something here for everyone.