How can PHP beginners ensure that they are properly managing MySQL connections to avoid errors related to too many connections?

When working with PHP and MySQL, beginners can ensure they are properly managing MySQL connections by closing connections when they are no longer needed. This helps avoid errors related to having too many open connections to the database. One way to achieve this is by using the `mysqli_close()` function to close the connection after executing queries.

// Establish a connection to the MySQL database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Check if the connection was successful
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Perform database operations here

// Close the connection when done
mysqli_close($connection);