Apologies if this is a duplicate, not appropriate, etc. I have just installed Magento 2.0.0 and a lot of the documentation I am reading/watching mentions a 'magento' directory in lib/internal, but I my install does not seem to have this folder. Any ideas on why this might be would be amazing helpful. Thanks in advance.
I think you did the setup using composer.
In a composer installation of magento2 there is no lib/internal/Magento folder instead it is in the vendor folder, "vendor/magento/framework" to be precise.
But if you see the magento2 repository on Github you should see the "lib/internal/Magento" folder.