Over the years I have probably tried (and used) every feature that was added to Excel.

With growing wisdom I came to the conclusion that I will only use the most basic features (i.e. simple formulas using adding, subtraction, multiplication, division) when I need to share a sheet with third parties. Nearly all users are not proficient in the more advanced features - making collaboration an error prone hell.

To make things worse: Excel by nature is not made to be audited. That’s why I tend to add a generous amount of checksums or similar (visual) flags to my worksheets in order to catch errors early.

Excel is dangerous!