Seriously, as stated before, if you have to ask for a picture of what a differential looks like, then you need to avoid working on your own car.

There are three main points. The first is that in order to learn about cars, how they work, and how to fix or maintain them, you will have to read about them. This knowledge can be acquired from repair manuals and to some extent on the Internet. For instance, if you were able to post your request for a picture of a differential, then you should be able to go to www.google.com and type in automobile differential. You will get the answer instantly.

The second is that if you don't own the proper tools, you should be prepared for hundreds of dollars for tools. You need a floor jack for a couple of hundred bucks. You need good jack stands.

The third and most important is safety. You must learn how to safely jack up the car and safely place jack stands under the car at the proper points. Don't just jack it up with the jack intended for tire changing.

You will most probably be better off paying someone to maintain your car.

Steve