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HTML Exercises Many chapters in this tutorial end with an exercise where you can check your level of knowledge.

SQL Tutorial SQL is a standard language for storing, manipulating and retrieving data in databases.

Python Exercises Many chapters in this tutorial end with an exercise where you can check your level of knowledge.

This tutorial follows Bootstrap 3, which was released in 2013. However, we also cover newer versions; Bootstrap 4 (released 2018) and Bootstrap 5 (released 2021).

Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now »

Learn JavaScript The Programming Language of the Web JavaScript is easy to learn. This tutorial covers everything from basic JavaScript up to the latest 2025 version. Start learning …

C# Exercises Many chapters in this tutorial end with an exercise where you can check your level of knowledge.

In this tutorial you get a step by step guide on how to install and create a Django project. You will learn how to create a project where you can add, read, update or delete data.

W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, …