During the cold war, what if a country's military command center was destroyed by a missile? Even a good missile intercept system can't stop all enemy attacks 100%. Therefore, the best way is to cancel the military command center and disperse it so as to ensure that after the first round of nuclear attack, we can still control the situation and launch a counterattack.

This is also true of bitcoin and the preservation of monetary assets. There is no 100% safe way to do it, no matter whether it is a wallet or an exchange. Wallet files will be lost. For example, the computer is broken, the hard disk cannot be read, and there is a small probability that the wallet files will be stolen by hackers when they are placed in the network disk in the mailbox. If you lose your hardware wallet like a USB flash drive, you will never get it back. And the exchange may be stolen, closed down, run away, etc., or simply you forget the password. It's OK to forget the password. It's a big trouble to forget the registered email directly. If there is no real name authentication in the exchange, it won't come back.

Therefore, the recommended way is to divide bitcoin into several parts and keep them in different places. Both wallet and exchange should be considered. Let me talk about my own way for reference only:

• 
  20% in wallet; (blockchain wallet, Jaxx, coinomi, etc.)
• 
  20% on exchanges that can exchange legal currency directly; (coincola and local bitcoins are easy to convert into cash or buy at the bottom at any time)
• 
  Put 20% in the futures account, add a low leverage, when the price of bitcoin rises, the quantity of bitcoin will also rise, and force the closing price to be controlled below the current half price to ensure safety. (bitmex is commonly used in futures trading). Holding bitcoin is equal to looking long, so a small part of it is leveraged, and the forced closing price is very low, so there is not too much risk.
• 
  20% is put in the exchange used for trading small currencies, and there are promising small currencies that can also be invested;
• 
  20% is put in another small currency exchange to prevent the last one from going wrong. It's not too much to worry about. Even a big exchange with good reputation has risks;

Now, even if the wallet file is lost, the exchange is closed, stolen. The loss is also limited.

If you have a large amount of money, you may as well subdivide it into 20 copies. In my opinion, putting hundreds of bitcoins in a wallet or an exchange is extremely risky.