How do I transfer my wallet? If I have my wallet on my computer, and I would like to transfer it to a Laptop or make a backup, how do I do that? And also, is it possible to transfer an online wallet to an offline wallet? Like from CoinBase to my Laptop?
If you're using a client, you can just export the wallet.dat through an option, be sure to encrypt it!

If you need to move your Coinbase "wallet", you can just send the balance to an offline wallet address.