Before you begin to do repair work on your bike, you need to know what exactly is broken. A bicycle is made up on hundreds of parts all working together to get you where you need to go. Here is a basic list of components that make up a bicycle.
Handle Bar and Grips
Once you have localized what exactly is wrong, you need to move onto more detailed information about your type of bike and its construction because not every bike is the same. A Fixed Gear Bike will have very little in common with a Mountain Bike. And if you’re going to repair anything with a motor you need to look into scooter repair.