How do you quickly autofill a series of numbers in a spreadsheet?

Using the fill handle to autofill a series of numbers in a spreadsheet is an efficient way to populate a range without manually entering each value. When you create a series in a cell by entering the first number, you can use the small square at the bottom right corner of that cell, known as the fill handle. By double-clicking on this fill handle, the spreadsheet will automatically extend the series down a column to fill in the subsequent cells with the appropriate values based on the pattern established in the first cell.

This method is especially useful for generating sequences like consecutive numbers, dates, or even days of the week, as the software intelligently recognizes the series and applies it across the selected cells. It saves time and minimizes the risk of errors that might occur if you were to enter each number individually. Other methods mentioned, such as right-clicking to select "Autofill" or copying cells, may not provide the same quick functionality and might require additional steps, making double-clicking the fill handle the most efficient choice for autofilling a series.