Now many are interested in cryptocurrency. Some investors invest in bitcoin and some in altcoins, if you are interested in the structure of the work of these projects and what kind of security they have, then here is information about Ethereum smart contract audit. There will be useful points about the structure of work and how it can be secured
http://www.polkadotflorist.co.uk/2022/06/how-to-audit-an-ethereum-smart-contract/