To help prevent bugs it is important to thoroughly secure and test your software.
First, build software to work assuming the user is using it properly. Then you can add in cases to protect against intentional bad inputs. For example, you should protect against SQL injections, cross site scripting, etc. Learning software development is one of the best ways to get skills in cybersecurity because you're learning the inner details of how things work and how to protect against cyber attacks.
Software testing can be used to ensure we get the expected results for bad inputs. For example, we can create a list of things we want to test such as what happens when we put in bad data.