How can PHP beginners effectively incorporate menu navigation into their websites?

Beginners can effectively incorporate menu navigation into their websites by creating a separate PHP file for the menu, including it in each page using the `include` function, and styling it with CSS to make it visually appealing and user-friendly.

//menu.php
<ul>
  <li><a href="index.php">Home</a></li>
  <li><a href="about.php">About</a></li>
  <li><a href="services.php">Services</a></li>
  <li><a href="contact.php">Contact</a></li>
</ul>
```

In each page where you want to display the menu, include the menu file:

```php
//index.php
<!DOCTYPE html>
<html>
<head>
  <title>Home</title>
  <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
  <?php include 'menu.php'; ?>
  <h1>Welcome to our website!</h1>
</body>
</html>