what is the use of grid system in bootstrap code example
Example 1: bootstrap grid
<div class="container">
<div class="row">
<div class="col-sm">
One of three columns
</div>
<div class="col-sm">
One of three columns
</div>
<div class="col-sm">
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