From the basics to advanced topics with simple, but detailed explanations. Main course contains 2 parts which cover javascript as a programming language and working with a browser. There are also additional series of thematic articles. Here we learn javascript, starting from scratch and go on to advanced concepts like OOP. We concentrate on the language itself here, with the minimum of environment-specific notes. Today, javascript can execute not only in the browser, but also on the server, or actually on any device that has a special program called the javascript engine. The browser has an embedded engine sometimes called a “javascript virtual machine”. Modern javascript is a “safe” programming language. It does not provide low-level access to memory or the CPU, because it was initially created for browsers which do not require it. javascript’s capabilities greatly depend on the environment it’s running in. For instance, Node.js supports functions that allow javascript to readwrite arbitrary files, perform network requests, etc. In-browser javascript can do everything related to webpage manipulation, interaction with the user, and the webserver. This book is a tutorial. It aims to help you gradually learn the language. But once you’re familiar with the basics, you’ll need other resources.