If you need to add a comma after the first word in each cell in Excel using the Replicate or Substitute function, read through this article.

A comma delimited file cannot process any information other than straight data. This means that if your Excel spreadsheet has formulas in it, only the formula result will be saved in the CSV file.

You can count the number of values in a single cell in Excel and Google Sheets that are seperated by comma using this function or formula.