Answers for "how to keep image within the container using bootstrap"

bootstrap 4 image fit to div

<div class="container">
    <div class="col-md-4 px-0">
        <img src="images/food1.jpg" class="img-fluid">
    </div>
</div>

responsive image in bootstrap

<img src="..." class="img-responsive">

img-fluid bootstrap

<img class="img-fluid" src="" alt=""> //This will make your image responsive

image container bootstrap

<!-- FULL-WIDTH IMAGE --> 
<div class="container-fluid">
  <div class="row">
    <div class="col-12 px-0">
      <img class="img-fluid" src="your-image">
    </div>
  </div>  
</div>

<!-- 12 COLUMN IMAGE --> 
<div class="container-fluid">
  <div class="row">
    <div class="col-12">
      <img class="img-fluid" src="your-image">
    </div>
  </div>  
</div>