Sorry this is probably a stupid question but I really don't know can someone briefly explain what "Bitcoin Core 0.9.3" is for me? Every post I look at about it assumes that everyone understands what it is. Is it something that I need to have if I have bitcoin? Who is the person that updates these things and "regulates" the bitcoin system?
you don't need Bitcoin Core to handle your bitcoins. it is one option, or in other words it is one of the many wallets that you can have but it is the original thing.