displaying data in an html table

I need to display some products in an html table as follows: Products 1-3 in row 1, products 4-5 in row 2, etc. How do I set up a repeating region to make that happen? I tried repeating the cell, but of course that just keeps repeating in one row. Please bear in mind I am very new to PHP (obviously). Could someone direct me to an easy to understand tutorial for this? Thanks!