Hello Contridiction!
Don't worry, it will be alright, I already got you covered, see. 
All the commands you ever wanted and what they do, can be found there.
I order my can of Deoxit online on Amazon, and it can also be purchased at other places online. I don't think you will find a can of that stuff locally unless its an electronics/computer store. The stuff is expensive I know, but you use it very sparingly, like, literally a 1-second press of that stuff is usually enough to clean a tiny part.
Dialetric grease is good on automotive and tractor battery terminals, helps to keep them from corroding or rusting. But I would think twice about using it in computers.
Yes, I have been wondering about that as well. I am not exactly sure why the Zorin bro's have not updated the page to reflect other options. I know, it sets up users to make possible mistakes that could be detrimental. I don't know what to tell ya, I am not one of the developers, and neither am I am admin.
Keep in mind, Zorin OS is made by only 2-people, thats right, even after all these years, its still been, only 2-people. So, we can't really compare them to other distro's like POP OS for example, where System76 who makes it, have over 100 people on their team.
There has already been a fair scope of criticism, but its not really our place to tell the Zorin brother's how they should run their business. As two guys who started Zorin OS as a couple of teenagers back in collage, and now very successful after nearly 13-years of service with Zorin OS, that alone speaks for itself.