YOu could use divs (styles to make them appear as 3 columns not provided):
<div id="wrapperDIV"> <div id="col1">column 1</div> <div id="col2">column 2</div> <div id="col3">column 3</div> </div>
or what i prefer is tables:
<table> <tr> <td>col 1</td> <td>col 2</td> <td>col 3</td> </tr> </table>
You’ll then have to learn how to connect to a database of some sort using php and then save what the user entered into the rtf editor into the database to display it later.