The make quality of the iPhone is top notch so if it got physically damaged you some idea about the parts you are going to replace. If some have some knowledge about the parts it will be helpful if you are some minor issue with your iPhone.
The first thing to learn about iPhone parts is the screw. The screws are the most essential parts for replacing any part in your phone. iPhone screw can only be removed by the specially designed screwdriver so make sure to get one. Then comes the replaceable parts like screen, battery and more, these types of parts can be replaced by people who have simple knowledge about phone repair. You don’t have to do anything just remove the screws and displace the screen or battery from their blocks and fix the new into the place where it is removed it is simple as that. If the problem is huge then take your phone to iPhone Service Center in Chennai.