Double quotes, variables are interpreted Herodoc string, format on multiple lines $a = "Hello World"; echo '$a'; // $a echo "$a"; // Hello World
Python comand line Mistakes on purpose, helps to remember $ python >>> print('Hello World!') print 'Hello World' # SyntaxError
Js code can be inserted into HTML It can also be saved into an external file <script> alert("Hello World"); </script> <script src="hello.js"></script>
In Java, everything goes into a class (.java file) A class is a blueprint for an object public class MyClass public static void main(String[] args)