bootstrap container row column code example

Example 1: how will it look when there is a container inside a a row bootstrap

<div class="container">
  <div class="row">
    <div class="col align-self-start">
      One of three columns
    </div>
    <div class="col align-self-center">
      One of three columns
    </div>
    <div class="col align-self-end">
      One of three columns
    </div>
  </div>
</div>

Example 2: bootstrap grid class

col-12 col-sm-4 col-md-3 col-lg-12	col-xl-12

Example 3: .row bootstrap

.row{
    display: flex;
    flex-wrap: wrap;
	margin-right: -15px;
    margin-left: -15px;
}