In order to highlight duplicates in Google Sheets, you should first navigate to Google Sheets.
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Once you open your spreadsheet, highlight the column or row you want to highlight.
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Then, go to "Format".
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And then, you should click on "Conditional formatting".
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Then, you should click on the dropdown below "Format rules".
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Now, you need to scroll all the way to the bottom of the dropdown. Then, you should click on "Custom formula is".
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Now, you need to click on the field of "Value on formula"
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And then, type the COUNTIF formula, which is "=COUNTIF (ROW:ROW, ROW2)>1". So, in this case, since I'm working with the column B, the formula looks like **=COUNTIF (B:B, B2)>1.** And that's all!