to Excel than these well know and well described ways to screw up a spreadsheet. What about the use of white-coloured text in a cell, so that other people would not change them (not protected or hidden, obvious what will happen, not?)? Or the use of hyperlinks from one sheet to another (that fail as soon as the file is moved to another directory)?

You can use Excel without a training, but you should invest some time or money if you want to do more that just basic stuff with Excel. Just to prevent coworkers having to clean up after you.

Susan, I expect that you could've made a list of 100 ways without any problem! Thanks for this article.
Martin