I read recently in some blog that the only procedure that can guarantee the security of smart contracts is a smart audit. That is, it is a check to order of the development code.
I know for sure that no project can be perfect in the early stages of development. It needs to be tested many times and bugs fixed in order to guarantee high-quality performance and maximum security later.
In order for a smart contract to be secure, it must be audited. Developers can do it themselves or use the services of well-known audit companies that provide such services. The smart audit https://www.h-x.technology/services/smart-contract-audit provides a guarantee that they do not contain critical errors that can lead to hacking of the application, the exchange, and theft of funds.