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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.

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 …

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 »

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).

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, …

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

The box-sizing property allows us to include the padding and border in the box's total width (and height), making sure that the padding stays inside of the box and that it does not break. You …