It is always recommended to apply the latest security patch to your operating system provided by your operating system vendor. This helps to fill any security holes in the system and protect your system from vulnerabilities where attackers are able to steal your security certificate or run arbitrary code. Make sure to integrate secure coding best practice to your software development process, as recommended by the Open Web Application Security Project (OWASP: https://owasp.org/www-project-top-ten/).

Keeping your system up to date with the latest security patch is very important. It is better to automate the process of the most recent patch installation as soon as it becomes available. However, sometimes, running a security patch may break your working software, so it's better to set up a Continuous Integration and Continuous Deployment (CI/CD) pipeline with automated test and deployment. You will learn more about the CI/CD process in Chapter 12, DevOps and Solution Architecture Framework.

AWS cloud provides a system manager tool that allows you to apply security patches and monitoring of your server fleet in the cloud. You can use a tool such as auto-updates or unattended-upgrades to automate security patch installation.