Cheers.
If I download wallet software such as "bitcoin core", can I create numerous wallets within this or is it just one wallet?
From what I have read, you can have numerous addresses in one wallet. And addresses are made from a public and private key combination? Is it possible for two people to have the same public key but a different private key of does each private key always generate a unique public key?A wallets are just a file that hold your private keys. The private keys are all that matters, but it is very convenient to keep your keys safe by keeping your wallet.dat file safe.
I don't think two different public keys can match a private key, buy two instances of bitcoin core can independently generate the same public private key pair, but the odds against it happening during the lifetime of the sun is practically zero.
All right, I'm out of what little steam I had

, but that bitaddress.org is better if you download the java and run it on a secure computer. You would then need to import the private key into a fully updated client or a website like blockchain.info. Make sure you trust who you keep your coins with.
