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HTML

The language for building web pages

Learn HTML HTML Reference
HTML Example:
<!DOCTYPE html>
<html>
<head>
<title>HTML Tutorial</title>
<body>
  <h1>This is a heading</h1>
  <p>This is a paragraph.</p>
</body>
</html>
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CSS Example:
body {
  background-color: lightblue;
}
h1 {
  color: white;
  text-align: center;
}
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CSS

The language for styling web pages

Learn CSS CSS Reference

JavaScript

The language for programming web pages

Learn JavaScript JS Reference
JavaScript Example:
<button onclick="myFunction()">Click Me!</button>

<script>
function myFunction() {
  let x = document.getElementById("demo");
  x.style.fontSize = "25px";
  x.style.color = "red";
}
</script>
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Python Example:
if 5 > 2:
  print("Five is greater than two!")
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Python

A popular programming language

Learn Python Python Reference

SQL

A language for accessing databases

Learn SQL SQL Reference
SQL Example:
SELECT * FROM Customers
WHERE Country='Mexico';
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