Introduction

In this tutorial, we'll dive deep into understanding Bootstrap's grid system. By the end, you'll know how to use rows, columns, and gutters to create responsive layouts.

You will learn:

• The basics of Bootstrap's grid system
• How to use rows, columns, and gutters
• Creating responsive designs with Bootstrap

Prerequisites:

• Basic knowledge of HTML and CSS
• Basic understanding of responsive design

Step-by-Step Guide

Bootstrap's grid system uses a series of containers, rows, and columns to layout and align content. It's built with flexbox and is fully responsive.

Containers

You can choose between a fixed-width container (.container) for a responsive pixel width or a fluid-width (container-fluid) for a full-width container spanning across the viewport.

<div class="container">
  <!-- Content here -->
</div>

Rows

Rows are horizontal groups of columns. Content should be placed within columns, and only columns may be immediate children of rows.

<div class="row">
  <!-- Columns here -->
</div>

Columns

Columns create gutters (gaps between column content) via padding. That padding is offset in rows for the first and last column via negative margin on .row.

<div class="col">
  <!-- Content here -->
</div>

Columns have responsive variants like .col-sm, .col-md, etc. for different screen sizes.

Code Examples

Here's an example of a simple Bootstrap grid layout.

<div class="container">
  <div class="row">
    <div class="col">Column 1</div>
    <div class="col">Column 2</div>
    <div class="col">Column 3</div>
  </div>
</div>

This creates a row with three equal-width columns. Columns will stack vertically on smaller screens.

Summary

We've learned the basics of Bootstrap's grid system, including containers, rows, columns, and how to make layouts responsive.

Next, you could explore more about Bootstrap's utilities for layout, content, and components.

Additional resources:
- Official Bootstrap Documentation

Practice Exercises

1. Create a layout with two columns of equal width.
2. Create a responsive layout with three columns on large screens, stacking to two columns on medium screens, and to a single column on small screens.

Solutions:

<div class="container">
  <div class="row">
    <div class="col">Column 1</div>
    <div class="col">Column 2</div>
  </div>
</div>

<div class="container">
  <div class="row">
    <div class="col-lg-4 col-md-6">Column 1</div>
    <div class="col-lg-4 col-md-6">Column 2</div>
    <div class="col-lg-4">Column 3</div>
  </div>
</div>

Keep practicing to get more comfortable with Bootstrap's grid system. Happy coding!