I just want to know how those people behind bitcoin secure the money they will invest because as far as I know there are lots of hackers all over the world.
To secure your bitcoin investment you have to put it in a hardwallet or offline wallet that you own the private keys never give your keys to anyone else you do not trust. That's the only and safest way to put your money in a secure place, exchange site is never secure so if you have some their make sure that its only for trading.