If you see in a column in an Excel worksheet, what is wrong?

answer too long but

Explanation:

Excel Error Messages You're Sick of Seeing (And How to Fix Them)

We've all fallen victim to the little green arrow in upper-left hand corner of a cell before. You know, that pesky little flag that Excel uses to indicate something has gone wrong with the values in the cell.

In many cases, clicking on that arrow will pull up enough information for you to remedy the problem at hand. Take a look:

Options dropdown to the left of a #VALUE! Excel error message

But in other cases, you still can't seem to figure out what's gone wrong with your spreadsheet to solve this error. For those cases, we've provided the following list of common errors, explanations, and tips for overcoming them. Dig in for the context you need to right your wrongs and get back on the Excel saddle.

1. #VALUE!

Excel displays the #VALUE! error when it finds spaces, characters, or text in a formula where it is expecting a number.

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professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).