1. Introduction

In this tutorial, we aim to provide a comprehensive overview of JavaScript event listeners. Event listeners are an integral aspect of interactive web development, allowing web applications to respond to user actions like clicks, key presses, and more.

Upon completion of this tutorial, you will be able to:
- Understand the concept of events and event listeners in JavaScript
- Implement event listeners in your JavaScript code
- Understand the differences between different types of events

Prerequisites:
- A basic understanding of HTML and CSS
- Some familiarity with JavaScript syntax

2. Step-by-Step Guide

An event listener in JavaScript is a function that waits for an event to happen. The event could be a click, a page load, or any other user interaction.

To add an event listener to an element, you use the addEventListener() method. It takes two arguments: the event to listen for, and the function to execute when the event occurs.

For instance:

javascript element.addEventListener('click', function() { // code to execute when the element is clicked });

The first argument is the event type - a string that specifies the name of the event. The second argument is the event handler function - the code that will run when the event occurs.

Best practices and tips:

• Always remove event listeners when they're no longer needed to prevent memory leaks.
• Use the event object inside the event handler function to get more information about the event (like the target element).
• Remember that not all HTML elements can trigger all types of events.

3. Code Examples

Example 1: Add a click event listener to a button

html <button id="myButton">Click me!</button>

```javascript
// Get the button element
var btn = document.getElementById('myButton');

// Add an event listener to the button
btn.addEventListener('click', function() {
alert('Button clicked!');
});
```

When the button is clicked, an alert box with the message "Button clicked!" will appear.

Example 2: Use the event object in an event handler

html <button id="myButton">Click me!</button>

```javascript
var btn = document.getElementById('myButton');

btn.addEventListener('click', function(event) {
alert('Button clicked by a ' + event.clientX + ' at Y: ' + event.clientY);
});
```

This will alert the X and Y coordinates of the mouse pointer when the button was clicked.

4. Summary

In this tutorial, we learned about JavaScript event listeners and how to use them. We discussed the addEventListener() method, the event types, and the event handler functions. We also covered some best practices and tips for working with event listeners.

To further your understanding, we recommend experimenting with different event types and exploring more advanced topics like event propagation and default actions.

5. Practice Exercises

Exercise 1: Add a 'mouseover' event listener to an image that changes the image source when the mouse pointer is over the image.

Exercise 2: Add a 'keydown' event listener to the document that alerts the name of the pressed key.

Solutions:

Solution to Exercise 1:

html <img id="myImage" src="image1.jpg">

```javascript
var img = document.getElementById('myImage');

img.addEventListener('mouseover', function() {
img.src = "image2.jpg";
});
```

Solution to Exercise 2:

javascript document.addEventListener('keydown', function(event) { alert('You pressed the ' + event.key + ' key'); });

Continue practicing by creating your own HTML elements and experimenting with different event listeners. Happy coding!