Hi @LinuxClifford - welcome to the Red Hat Learning Community! There are many different ways to begin learning about Linux, whether it be a formal training course, articles, videos, webinars, or speaking with Linux subject matter experts in this community. Here are a few resources you might be interested in:
My advice to you is to define what you want to do as a career and work backwards from there - if that includes learning Linux, becoming a Linux system administrator, or building a career in open source technology, than you have come to the right place.
I hope this helps,
Like @Deanna, resources to learn Linux are varied and vasts. I would suggest before studying the material for the exam, having some fun exploring Linux:
After that open the terminal and see what you can make your computer do. The terminal has a lot of power and you can automate tasks very easily.
My favorite commands are: wget, vim, ssh.
To learn more about the terminal I recommend the website https://linuxjourney.com/
Or the book The Linux Command Line.
Learning linux changed my life for the better, hope it does the same for you.