Coins should always be considered in a safe storage, there are lot of wallets and platform that could be used to hold coins, both of this has good side and bad. Where will you choose to store or hold your coins, in a close source wallet (exchanges) or an open source wallet like electrum and Hodler wallet?
Even the CEO of binance said that it is not good to store our coins in a exchange. The most preferable storage us still the cold storage for you ensure the safety of your cryptocurrencies.
No doubts that it is the safest that we can have, if we know how to secure it properly and we follow every precautions that can be done avoiding
hackers to penetrate with our wallets, we do need to make sure that we review and research what are those particular ways that hackers can
overtake your protections, needs to know every single details how to prevent that,.