width of one bootstrap column to change depending on device width? 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: whatever by Clever Crane on May 31 2020 Donate Comment

<div class="col-lg-3 mb-4">