Linux is a versatile, open-source operating system renowned for its stability, performance, and enhanced security aspects. Linux, which forms the basis of countless operating systems such as Ubuntu, Fedora, and CentOS, imparts crucial tech skills that are desirable in diverse fields like software development, network administration, and cyber security.

Extensive knowledge of Linux involves understanding its command-line interface (CLI) environments, shell scripting, system and network configurations, directory structures, and permissions management. Working with Linux systems also means adopting the Git version control system, which is integral for collaborative software development and efficient code management.

Moreover, Linux proficiency includes an understanding of various system processes, task scheduling, as well as managing databases using tools such as MySQL. With servers often powered by Linux, skills like Apache or Nginx configuration, understanding LAMP (Linux, Apache, MySQL, PHP) stacks, and fine-tuning performance are desirable.

Linux containers technology such as Docker and orchestration tools like Kubernetes are widely used for rapid deployment, scaling, and management of applications, making them crucial additional skills to master. Familiarity with cloud infrastructure platforms that largely employ Linux, such as Amazon Web Services (AWS) and Google Cloud Platform, is an added asset.

As a foundation for learning Linux, a basic understanding of computer systems and experience with any operating system is valuable. Knowledge of basic Networking concepts and familiarity with command-line interfaces can make the Linux learning curve less steep. Programming skills, especially in languages like Python, Bash, or Perl, are beneficial as Linux administration often involves scripting tasks.

Mastering Linux can significantly ramp up your tech skill set, making you a valuable asset to any tech-centric organization. Furthermore, it can open up a multitude of lucrative, high-demand career opportunities such as Linux System Administrator, DevOps Engineer, and Software Developer.