Personally, I am very skeptical about the security of an Crypto wallet. The reason why I haven´t invested thousands of euro´s into crypto currencies, is because I heard about many ways you can lose your wallet.
Let´s start with the differences between an online and offline wallet. The moment you leave your cryptocurrencies in your online wallet it means you have access as long as there is access to the internet. The security issues with this is that hackers might also have access to it. Therefor I invested time in seeing what offline possibilities are there. I found the following.
One option is storing the coins on your laptop in a virtual offline wallet. The crypto coins are there for saved on your computer. The negative point with this is that when your computer crashes, in the worst-case scenario you lose all your coins as well. Next to that you can lose the password. Since the password is not backed up by a website, there is no way to trace it.
You can also choose for hardware to store the crypto coins. This video will show you which options you have regarding hardware wallets: