The first step to becoming a Linux Admin is to install a Linux Operating System. Install any Linux OS and get to know the environment. Learn the basic commands. There are lots of tutorials that will teach you this. Get comfortable with Linux, know the tools, services, etc. Next, you will have to practice. Watching a tutorial is easy because most of it is only copy-paste. So, learn more. Learn about the architecture, try experimenting with commands, read the document. Youtube and Blogs are your best friends here. Then get certified. There are lots of Linux Admin Certificates on the internet. Check the review, get certified. At last, update your profile, attend interviews and get a Job.