Mike, just hang in there. That's a good machine, I have the same thing. Take a look at the tutorial that chscag pointed to in Post #15. Part of that first link to Apple has this:
https://support.apple.com/en-us/HT204216
That will give you fundamental tasks with comparison to Windows. Basically, it's still a computer and it still does all the same things as on Windows. There is no registry, which makes life a lot better because you don't need to worry about the registry being mucked up. Applications are, generally, self contained so installing them is as easy as copying them to the Applications folder. Some take more, but most are just that simple.
One more key difference is that Windows was designed from the ground up for a single user, whereas the Mac OS was derived from Unix/Linux, which was, from the beginning, a multi-user system. That difference in origins drives a lot of the differences between the two systems. There are, in macOS, two types of user accounts--Admin and Standard. Every user gets their own space in which they can read and write files. But no user can read or write to another users space. Standard users can install software, but only for themselves. If you want to install software for all users, or if the software needs to be available to all users, you have to have Admin authority to do that. So, when you install software, you will get a prompt to enter an Admin password. If you are an Admin, that's your password to login. I know Windows is starting to get to that kind of security in Win10, but it's a fundamental part of macOS and has been for a long time.
Similarly, in Windows you can read/write to any file in any place on the drive. But in macOS, your authority is limited to the folders in your space. Each user gets their own space, as I said. With each iteration Apple has tightened up security so that malware cannot get to critical system files. That blocking can sometimes frustrate switchers to Mac because they are used to the wide-open nature of Windows. Once you get used to it, the design of macOS makes sense for a multi-user system.
So, start with the articles at Apple that you have been given links for. And note that in the link I gave there is a link at the bottom of the article to a "What's it called on a Mac" article that will take you to a side-by-side glossary of terms so you can transfer that Windows terminology to the Mac. (As an aside that "what's it called" is in the macOS user guide. You can select your version at the opening page of the guide and see the information specific to your machine.)
I remember my early frustration with my first iMac. But hang in there, it will start to make sense as you go along.
You mentioned Finder. It's the Mac equivalent of File Explorer (I think that is what Windows calls it). Read this:
and then this:
https://support.apple.com/en-us/HT201732
In general, you can go to Apple.com, click on support and type in what you want to know in the search window to be taken to a support page. Apple really does try to make it easy to switch.