Gather as much information as possible about your car issue, including photos and videos capturing when a problem occurs. Not all information online is correct, and that goes for car repair advice.
While plenty of mechanical issues can render your car unusable for a while, there are lots of other problems that can go unaddressed if you're pressed for time or money. A malfunctioning climate ...
Even if you don't know much about cars, you know your own car. That knowledge can help you explain a problem to a professional.