So you are about to buy a new TV and the store selling it to you tries to convince you that you need the “mega expensive” HDMI cable as it will deliver ” outstanding picture quality ” etc .
This is purely a marketing trick to get you to part with some extra money for a cable that you can get for half to a quarter of the price.
HDMI is a digital signal , 0s and 1s , and will work the same on a $10 cable or the expensive cable which is usually sold at a “Monster” price
Copy
Copy is cloud storage where they will give you 15GB of storage on the internet where you can store , documents , photos etc
You can install it on your computer , smartphone and tablet and access your information on all these devices as there are Apps for iOS for iPads & iPhones and for Android devices.
Your documents are still on your computer but a “ copy “ is also in the cloud.
Change a document on one device and it is synced to the cloud and on all your devices that have Copy installed.
Copy is free
Your Hdmi "advice" is over simplified, like comparing a bus with a scooter… Thery both carry people…