There are several ways you can do columns of content with HTML. The old way would be to use tables to create the columns. This isn't ideal and is a bit old school. Here is a standard way to do this with CSS and floating divs (make sure you use HTML view in the WordPress editor to do this).
<div class="column">Column 1</div>
<div class="column">Column 2</div>
<div class="column">Column 3</div>
<div class="column">Column 4</div>
Make sure you include the following CSS in your style sheet:
Just replace the width of the column with your own width and make sure you have enough room to fit 4 of those columns (plus the padding) horizontally. Good luck!