How can beginners avoid common mistakes when assigning variables in PHP?

Beginners can avoid common mistakes when assigning variables in PHP by ensuring they use valid variable names, avoid using reserved keywords, and initialize variables before using them. It's also important to pay attention to data types and avoid reusing variable names to prevent unexpected behavior.

// Correct way to assign variables in PHP
$first_name = "John";
$age = 30;
$is_student = true;