Control + F
One of my daily visits brought me to a growing business today. As I waited to work on one of the employee's computers, I noticed that she spent a good 10-15 seconds scrolling through a medium size spreadsheet looking for a particular entry. I then asked if I could give her a quick tip on how to search through her spreadsheet faster using Ctrl+F on her keyboard. She said, "sure".
When you push Ctrl+F in a spreadsheet, a "Find" window appears. Type part or all of a word that you are looking for (or numeral) and press Enter and BAM the entry appears instantly. The tip is quick, accurate, and extremely helpful.