Now I will show you how to draw an easy little car like this:

I'll show you the frames of it:

First off start with a red box, like the one above (made with the rectangular tool. Now change the color to black and made a little box like this:

Which will be one of the wheels (I always do the front left wheel first) and then make a little square like this:

Which will be the front window (don't need to be black if you think another color fits better)... Then place it on your car (use the selection tool) where you would like the front window to be, like this:

And while you still have it selected, copy it (Ctrl+C) and paste in place (Ctrl+Shift+V). This might also be found in the Edit menu at the top of the page.

Then nudge it straight down using your arrow keys at your keyboard (while it is selected with the selection tool). So you have a back window too:

And now when we got the windows on place we got to place the wheel we made earlier:

Then, as we did to the window we will copy this (Ctrl+C) and paste in place (Ctrl+Shift+V). Then nudge it down to be a back wheel... When that is done you will do another paste in place and it will become a new black box on top of your front wheel which you are going to use as the other front wheel (nudging it over). And at last, select your back wheel, copy it, and paste it in place, before you nudge it over to the right... When doing this we got ourselves, four symmetrical wheels

Now grab your selection tool and make a nice little curve in the front of your car, I do it that way the corners of your car is straight in front of your window corners, and then I add the curve... After you have done that... grab your line tool and make some lines which makes the car look more realistic, here is my final result

Good luck!