There are many routes that you can go through to learn more about cars. Typically, you should start from the very basics... Such as how an engine and transmission work, and how specific parts of a car function. From the comfort of your own couch, there are plenty of YouTube videos, online guides, and other write-ups and content that you can try to follow and study to get a grasp of how cars work. Or, you could visit a local library and read some books there. Once you've understood the basics, you can dive deeper and read detailed repair manuals or have conversations with other budding enthusiasts on forums.