jQuery is absolutely one of the most popular JavaScript frameworks, and still widely used today. 65% of the top 10 million websites in the world is using jQuery, so its importance is self-evident. jQuery's philosophy is "Write Less, Do More", advocating writing small amounts of code to achieve complex functions. It is simple, fast and lightweight, provides rich functional interfaces, and is suitable for modern, rapid Web development.

Linux is cool not just because it's free and open-source, more often than not, that's because it's so powerful. For example, it is used to build large servers with high performance and high stability; to make the old computers bloom; as desktop or office operating system for individual users or enterprise users, and more. I think any users who are interested in computers, somewhat get tired of Windows, and want to try some new OS, they may want to begin to reach the mysterious Linux operating system. But if you want to make learning Linux easy, you really need a good book for the level of beginners.