I can totally understand why the terminal seems confusing and scary right now, but it’s actually awesome for this kind of stuff because you can just copy and paste commands to do pretty much anything to your computer. Using a GUI often means having a bunch of screenshots that you have to follow manually to do something that a single command can do. Once you’re used to the terminal for these kinds of things GUIs can seem barbaric. Of course it seems scary before you know much about it because it seems like the fucking matrix, and you should only run commands from sources you trust (because they can do anything)… But it’s worth giving a chance, I think.
For this particular instance… often you can just download an application on Linux from a website and run it, but this is almost never the preferred way of doing things. Usually you install applications from your package manager, which is kind of like an App Store (but free), and the advantage of this is that 1) you don’t have to hunt down sketchy executables on the internet, you have a vetted source of safe packages from your distribution, and 2) you can easily update all of your packages. Having a one stop shop for all of your applications (or at least most) is really great, but it can be a little annoying when something you want isn’t in the official repos (like this), though it’s usually a fairly rare occurrence.