Question: what is the most important thing in excel?
Answer: Conditional Formatting. Making sense of our data-rich, noisy world is hard but vital. ... 
PivotTables. At 4 hours to get to proficiency, you may be put off learning PivotTables, but don't be. ... 
Paste Special. ... 
Add Multiple Rows. ... 
Absolute References. ... 
Print Optimisation. ... 
Extend Formula Across/Down. ... 
Flash Fill.