How-to articles, tricks, and solutions about PORT
How to configure port for a Spring Boot application
To configure the port for a Spring Boot application, you can use the server.port property in the application's configuration file. The configuration file can be a application.properties file in the classpath, or a application.yml file in the classpath.
XAMPP Port 80 in use by "Unable to open process" with PID 4
It looks like you are having an issue with XAMPP and port 80.