You can add a column in Excel by right-clicking or using the “Insert” option. These features are helpful for adding new data to a spreadsheet.

How to combine values into a single cell using TEXTJOIN () in Excel Microsoft 365, Excel 2019 and Excel for the web support the function, TEXTJOIN ().

If you want duplicate values to stand out in an Excel spreadsheet, you can choose between two conditional formatting rules.

If you wish to count the same or duplicate values in a column only once in Excel or the count of occurances of duplicate values, read this article.