you can take a college course, or any auto course for that matter. You can check out this site for specific info on stuff and if you don't find something with the search button (very useful and doesn't waste peoples time with stuff that's been discused a million times before i.e. turbo vs super, which is better) you can start your own thread. check out
http://www.howstuffworks.com, great info on the basics of anything like that. and do google searches. you can check some blogs that people set up to discuss or narate what they did/are doing to they're car. the internet is great if you don't want to spend money.