I know you’re tempted to just unplug your fans and let the case breathe naturally. Don’t. Airflow is not a suggestion; it’s the difference between a working PC and a space heater that crashes. Also, never set your fan curve to 0% unless you enjoy seeing your CPU hit 95°C in five seconds.
Another pitfall: fan headers are rated for limited power. If you try to split too many fans off one header, you might fry the motherboard port. Use a fan hub if you have more than three fans—it pulls power straight from the PSU, not the motherboard.