Learn practises to help you achieve better security.
To start of, there is no such thing as a secure system. Security is relative, you need to be one step ahead of an attacker. The fabric of low-level architecture – binary and assembly give you full privileges from the start. Operating systems have permission models; however, these are complex systems which will always have vulnerabilities without some kind of break through.
md5: Insecure and brokenSHA1: Insecure and brokenSHA256:SHA512:
Resources
https://expressjs.com/en/advanced/best-practice-security.html