In Bootstrap, content must be placed within

In Bootstrap, content must be placed within containers. These containers are either, a .container for a fixed width container, or a .container-fluid for a full width container, spanning the entire width of the viewport.

Here are the steps:

1. First, you need to include the Bootstrap CSS and JS files in your HTML file. You can either download and host Bootstrap, or include it through a CDN.

2. Next, you create a container by adding a <div> element with a class of .container or .container-fluid in your HTML file. This is where you will place your content.

<div class="container">
  <!-- Your content goes here -->
</div>

or

<div class="container-fluid">
  <!-- Your content goes here -->
</div>

3. Inside the container, you can start adding your content. Bootstrap uses a grid system for layout. So, you can create rows using a <div> with a .row class, and then create columns within those rows using <div> elements with .col-* classes.

<div class="container">
  <div class="row">
    <div class="col">
      <!-- Column content -->
    </div>
    <div class="col">
      <!-- Column content -->
    </div>
  </div>
</div>

4. You can also nest containers, rows, and columns as needed to create more complex layouts.

Remember, the content must always be placed within a container to ensure proper alignment and padding.