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

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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 JavaScript …

Click on the "Try it Yourself" button to see how it works. We recommend reading this tutorial, in the sequence listed in the left menu.

Python 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.

Click on the "Run example" button to see how it works. We recommend reading this tutorial, in the sequence listed in the left menu. C++ is an object oriented language and some concepts may …

XPath Standard Functions XPath includes over 200 built-in functions. There are functions for string values, numeric values, booleans, date and time comparison, node manipulation, …

Click on the "Run example" button to see how it works. We recommend reading this tutorial, in the sequence listed in the left menu.

We have created 43 tutorial pages for you to learn more about NumPy. Starting with a basic introduction and ends up with creating and plotting random data sets, and working with NumPy …