The Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.

Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.

Because timestamps are represented as serial numbers, you can subtract the earlier time from the later time to get the difference.

When calculating the difference between two dates, you may want to exclude weekends and holidays.

You can easily count the number of unique values of the range using a simple formula.

Applying a number format to a cell doesn't change the value but only how the value appears in the worksheet. Formatting can play a joke with you, e.g., the sum of values seems incorrect because Excel displays a limited number of decimal places, and their sum is not equal to the real sum.

The easiest way to enter a function into a formula is to use the Excel program's Insert Function dialog box.

The Excel TEXT function enables you to specify numbers and date format.

Excel formulas support many different operators. Operators are symbols that indicate what mathematical or logical operation a formula should perform. The following are the most common operators used in Excel.

If you simply need to perform a calculation, you can use the Formula bar as a calculator.