How to improve PC airflow for better cooling and performance?

When building or upgrading a PC , most people focus on performance-enhancing components such as a faster processor, a more powerful graphics card, or additional memory. While these upgrades can significantly improve performance, one critical aspect that is often overlooked is airflow. Proper airflow may not be as exciting as installing new hardware, but it plays a vital role in maintaining system stability, maximizing performance, and extending the lifespan of your components.