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UNIX and UNIX-like operating systems are the operating systems of the Internet. While you can learn to use the Internet without knowing UNIX, you can't be an Internet hacker without understanding UNIX. For this reason, the hacker culture today is pretty strongly UNIX-centered. There are many types of UNIX-like operating systems, the most popular being Linux, which you can run alongside Microsoft Windows on the same machine. Download Linux online or find a local Linux user group to help you with installation.  A good way to dip your toes in the water is to boot up a device called a live CD or USB, a distribution that runs entirely off a CD or USB without modifying your hard disk. A way to get a look at the possibilities without having to do anything drastic.  There are other UNIX-like operating systems besides Linux, such as the *BSD systems. The most popular *BSD systems are FreeBSD, NetBSD, OpenBSD and DragonFly BSD. All are open source just like Linux. However, it's important to remember that they are BSD and not Linux. MacOS on Darwin, a UNIX operating system that's on FreeBSD. Darwin is fully free and open source and is available from http://opensource.apple.com. Because the core of the system is UNIX, and macOS is very popular, many people have ported over Linux applications to macOS. You can get those programs with a package manager like homebrew, fink or MacPorts. Alternatively, you can just run Linux on a Mac alongside macOS. If you want to get super niche, you can even run an operating system like Open Indiana, which is based on the open source release of the Solaris operating system before it was acquired by Oracle and made closed source. OpenIndiana and Solaris made on UNIX System V, and, as such, are not compatible with  Linux applications. That said, there are many ports of Linux applications. You're probably better off just using macOS, BSD or Linux because they are much more popular and have many more programs available for them. . If you don't know how to program, learning basic HyperText Mark-Up Language (HTML) and gradually building proficiency is essential. What you see when you look at a website of pictures, images, and design components is all coded using HTML. For a project, set out to learn how to make a basic home page and work your way up from there.  In your browser, open the page source information to examine the HTML to see an example. Go to Web Developer > Page Source in Firefox and spend time looking at the code. You can write HTML in a basic word processing program like Notepad or Simple text and save your files as "yourCoolFileName.HTML" so you can upload them to a browser and see your work translated. . Before you start writing poems, you have to learn basic grammar. Before you break the rules, you have to learn the rules. But if your ultimate goal is to become a hacker, you're going to need more than basic English to write your masterpiece.   Python is a good "language" to start off with because it's cleanly designed, well documented, and relatively kind to beginners. Despite being a good first language, it is not just a toy; it is compelling, flexible, and well-suited for large projects.  If you get into serious programming, you will have to learn  Java is an alternative, but its value as a first programming language has been currently questioned in its particular state. Unlike Java, Javascript is very similar to Python as they are both a C-based language and extremely new user-friendly. Javascript is "the programming language of the web," so If you'd like to continue your learning in web development/hacking, Javascript is better to learn than Python. An alternative to JavaScript would be PHP C, the core language of Unix. C++ is very closely related to C; if you know one, learning the other will not be difficult. C is very efficient with your machine's resources but will soak up huge amounts of your time on debugging and is often avoided for that reason, unless the efficiency of your computer is especially important. It is probably a good idea to use a good starting platform such as Backtrack 5 R3, Kali or Ubuntu 12.04LTS.

Summary:
Run a UNIX-like OS, such as Linux. Write HTML Learn the language of programming