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This talks about data validation. It allows you to control exactly what a user can enter into a cell.  It will help you build a full proof spreadsheet. It also discusses naming cell ranges. Naming cell ranges is one way to keep track of important cell ranges in your spreadsheet. Data validation drop down lists help to enter your data in better and filter it so you only see what is necessary and your sheet is much easier to read. All of these tools can help you so much.

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This is about changing the arguments to work correctly with VLOOKUP. You can edit the functions to include all cells. After you edit it will recalculate and become what you wanted it to be. This lesson also discusses how adding more material to a workbook can break the VLOOKUP function. It suggests using a table so any new data will be included automatically.

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Before  you start using VLOOKUP, it will be helpful to know what it does. In the example, it will search for the Product ID number on the Products worksheet. It first searches vertically down the first column (VLOOKUP is short for "vertical lookup"). When it finds the desired product ID, it moves to the right to find the product name and product price. It's important to know that VLOOKUP will always search the leftmost column in the cell range. VLOOKUP is a bit more advanced than some functions.