Microsoft Excel keyboard shortcuts
Like most accountants, I have to resort to Microsoft Excel quite a lot. No accounting software can ever give you all the information you need to make business decisions. Similarly, some ad-hoc decisions just use estimated figures and any calculations can be easily done in a spreadsheet. The more you use software, the more you realise that keyboard shortcuts are often the fastest way to do things. The typical Windows Ctrl+C is very handy to copy something you have just selected with the mouse.
Excel to has lots of keyboard shortcuts. Here’s a great webpage with a long (if not full) list of Excel’s shortcuts.