How do I create 20 columns x 3 rows of text boxes?

I need to create a 20x3 grid that text can be inserted into, Please help!

You may consider using Input table field to achieve your requirement. You may also check the Spreadsheet widget to see if that helps.

https://www.jotform.com/widgets/spreadsheet

Hope this information helps! Please get back to us if you need any further assistance. We will be happy to help.