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

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 »

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

PHP Exercises Most chapters in this tutorial end with exercises where you can check your knowledge.

We recommend reading this tutorial, in the sequence listed in the left menu. Java is an object oriented language and some concepts may be new. Take breaks when needed, and go over …

R Examples Learn by examples! This tutorial supplements all explanations with clarifying examples. See All R Examples

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 …

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).

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