Eevee is one of the render engines that Blender uses. There’s the Workbench, Cycles and Eevee.
I use Cycles for realism and rendering, Eevee for testing and pre-visualization. So yes, I would it is a must to learn Eevee.
But just don’t worry, it is so much information the first time you watch one of those lessons, you can’t hold everything inside your head. So just watch it, watch the course and then come back to it after a while and watch it again, there’s no rush. You’ll see that after some time has passed and you watch it again, it’ll be so much easier to understand everything. So keep on keeping on, be patience.
