How can PHP beginners avoid common mistakes when defining HTML?

PHP beginners can avoid common mistakes when defining HTML by ensuring proper syntax and structure. They should pay attention to closing tags, nesting elements correctly, and using double quotes for attribute values. Additionally, beginners should utilize PHP's built-in functions like `echo` or `print` to output HTML content dynamically. 

<!DOCTYPE html>
<html>
<head>
    <title>My Website</title>
</head>
<body>
    <?php
        $name = "John";
        echo "<h1>Welcome, $name!</h1>";
    ?>
</body>
</html>

Keywords

HTML PHP syntax errors htmlspecialchars validation

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