in my point of view blockchain.info is the safe and secure. you have to try once in this wallet. next copay is also one of the safest wallet investing coins. armory, electreum, multibit and trezor wallets all are best for secure. first if all you have to try in blockchain.info next electreum. those all are best sites for investing bit coins. mostly i would like to recommended for blockchain.info. so you also try once this wallet. who are newbie this field i like to suggest blockchain.info.