Hello, there are also a lot of attacks from hackers on various social networks now, this happens from time to time all the time, and in some cases people lose their data. If you want to know about Types of DDoS Attacks, here is the full article about it. https://pentestapp.io/how-to-test-ddos-protection/

Now there are many companies that provide the opportunity to develop a smart contract and check them for vulnerabilities. And they provide a wide range of blockchain services, if you are interested in who they are and how they work, go to this article from blockchain cyber security companies ranking, in which you will learn a lot of new things https://cyberhacks.io/5-top-blockchain-cyber-security-companies-ranking/

If you are interested in how other cryptocurrencies work, for example, how solana smart contract auditing works, read the article below which will reveal the features of the blockchain system of this coin, and its other features. Read here https://cryptothreads.org/solana-smart-contract-auditing-services/