Primary storage refers to your RAM it is internal storage.
Secondary storage is any storage that is not the primary storage that permanently stores data. Examples are hard drive, tape disk drive, floppy disk drive and compact disk drive.
Off-line storage refers to any device that stores data that is not permanently attached to the computer. Example flash drives, The data remains on the storage device and can be connected to a different computer.
I wanna say threads bc cores r processors. And one can run multiple threads. Double check tht :)
This question has a ton of answers to it but, here are some basic ideas to help you out
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It is because many people want to be perfect just at the start, but there is always room to improvement, but people don't accept that, so they don't want to be better than what they are already, so the don't revise themselves or anything.