Excel 2016  / 2003 / 2007 / 2010 / 2013

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  Goal Seeking

  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.
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  Calculating the difference between two time stamps

  Because time stamps are represented as serial numbers, you can subtract the earlier time from the later time to get the difference.
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  Calculating the Number of Work Days between two dates

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

  A common type of date calculation determines the number of days between two dates.
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  Custom cell format

  Excel includes a variety of built-in formats that cover general, numeric, currency, percentage, exponential, date, time, and custom numeric formats. You can also design your own custom formats based on one of the built-in formats.
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  Check data entry for invalid entries

  You can greatly reduce data-entry problems in your workbooks by making Excel check entries before entering them in specific cells. To do so, you need to define restrictions and data-validation rules for those cells.
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  Increase the number of Undo levels in Excel

  By default, number of Undo levels in Excel 2016 is 100. You can increase or decrease this number, if it's necessary.
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  Creating Subtotals

  Excel's ability to create automatic subtotals is a handy feature that can save you a great deal of time.
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  Using advanced filtering

  In addition to manual data filtering Excel enables fully automated filtering based on data from the specified range of cells. Before you can use the advanced filtering feature, you must set up a criteria range. A criteria range is a designated range on a worksheet that conforms to certain requirements.
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  Excel Formula Evaluator

  If you would like to better understand how some of these complex array formulas work, consider using a handy tool - Formula Evaluator: