@media screen used to apply different styles depending on the device.

Generally speaking, web development can be difficult because of the rapidly evolving technology landscape and the requirement to stay current with new frameworks and tools. It can be difficult to ensure cross-browser compatibility and test your code on many devices. It is important to follow coding standards and conventions, use clear variable names, and properly comment code. It is also important to ensure that code is secure and follows best practices for data privacy and protection. Regular testing and debugging can help identify and address any issues before they become more significant.