Welcome to the AD&T Consulting Linux gateway. Here we provide you with an introduction to one of the great pillars of open-source computing—the Linux kernel. Why learn Linux? First, it's free to use. If you are reading this page, you are probably well-aware that the primary alternatives to Linux are not free. Also if you are reading this, you are probably the type of person who wants to learn about what's under the hood of that computer or have a need to take your programming skills to the next level. Learning Linux will help you reach those goals and serves as the foundation of the educational and training services that we offer. Let's get started.