There's a body of general knowledge that is applicable to most makes and models, and specific knowledge for each make and model. The specific knowledge is mostl

There's a body of general knowledge that is applicable to most makes and models, and specific knowledge for each make and model. The specific knowledge is mostly in service manuals and dedicated forums, but the general knowledge is widely available in video form. The general learning path is to get the general background online, then read the service manual for the exact procedure for your car or bike.