Simple explanation of the foundation grid system

grid-basic.html

 <div class="row">
    <div class="five columns">
      Content...
    </div><!-- / five columns -->

    <div class="seven columns">
      Content...
    </div><!-- / seven columns -->
  </div><!-- / row -->

grid-nested.html

 <div class="row">
    <div class="eight columns">
      <div class="row">
        <div class="six columns">
          Six columns (nested)
        </div>
        <div class="six columns">
          Six columns (nested)
        </div>
      </div><!-- / Close nested row -->
    </div><!-- / Close eight columns -->
  </div><!-- / Close row -->