You can keep your cryptocurrency in your personal wallet so far no body has asses to your wallet it is safe their, and you must copy down your private keys, jut them down and keep them in a good and comfortable place we're no body can see it. Don't ever store your cryptocurrency in an Exchange because if mistakenly the Exchange got hack your cryptocurrencies can be stolen, and don't make use of mobile wallets. Yes we know mobile wallet are use for securing of account, it is a platform we're you give people you don know asses to your wallet, what if they decide to still Your cryptocurrency, and their is noting we can do about it because we don't know them, Your cryptocurrency can be stolen through mobile wallet, that is Why saving or storing of cryptocurrency on a personal wallet is the best