BootStrap Online Editor

<!DOCTYPE html>
<html lang="en-US">
<head>
<title>BootStrap Example</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=yes">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
</head>
<body>

<div class="container">
  <div class="row no-gutters">
    <div class="col-sm-4">
      <h3>Column 1</h3>
      <p>Section 1</p>
    </div>
    <div class="col-sm-4">
      <h3>Column 2</h3>
      <p>Section 2</p>
    </div>
    <div class="col-sm-4">
      <h3>Column 3</h3>
      <p>Section 3</p>
    </div>
  </div>
</div>

Result