Bootstrap: Grid

<div class="container">
  <div class="row">
    <div class="col">
      
      </div><!-- col -->
    </div><!-- row -->
</div><!-- container -->

7 - 5 Grid

<div class="container">
  <div class="row">
    <div class="col-12 col-md-7">
      
    </div><!-- col col-md-7 -->
    <div class="col-12 col-md-5">
      
    </div><!-- col col-md-5 -->
  </div><!-- row -->
</div><!-- container -->

3 Spalten Raster

<div class="container">
  <div class="row">
    <div class="col-12 col-md-4">
      
    </div><!-- col col-md-7 -->
    <div class="col-12 col-md-4">
      
    </div><!-- col col-md-7 -->
    <div class="col-12 col-md-4">
      
    </div><!-- col col-md-5 -->
  </div><!-- row -->
</div><!-- container -->