1 coinbase.com blockchain.info
2 Electrum Multibit Mycelium
3 a paper wallet is a document containing all of the data necessary to generate any number of Bitcoin private keys, forming a wallet of keys...Storing bitcoins on paper wallets is not safe unless very strict security precautions are undertaken and
a paper-wallet is safe as offline, it's unable to leak to the internet. Obviously, you need to keep it in a way that it won't be available to visitors as well.
There are options to add a password to paper-wallets, which might help to deter casual discoverers.
4 Btc eth dash zcash doge ripple