Like in real life, your wallet must be secured. Bitcoin makes it possible to transfer value anywhere in a very easy way and it allows you to be in control of your money. Such great features also come with great security concerns. At the same time, Bitcoin can provide very high levels of security if used correctly.Always remember that it is your responsibility to adopt good practices in order to protect your money.

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Source: https://bitcoin.org/en/secure-your-wallet

I prefer "cold storage" wallets

Absolutely agree with this, most sensible way by far, in my humble opinion. There is never total security but it's the closest approach.

Just reading on bitcoinwiki, it says that to date there have been no verifiable incidents of Bitcoins stolen from hardware wallets and much of the time, the software is open source, allowing a user to validate the entire operation of the device. so...

A really important point is not to operate on a public Wifi....there are already several cases where hackers have stolen bitcoins on open unsecure wifis.

Paper wallets or hardware wallets is one way to go, but once lost, it's gone. Some online wallets such as SpectroCoin have 2FA for logins and for each attempt of a transaction. It also notifies you whenever a new IP address logs in to your account and stores the cryptocurrencies in an offline (cold storages). It provides a very secure environment for all users and promotes safety for such an era.