You don't need a special program like photoshop to be able to crop. All you need is paint that you all have in your computer.

Well firstly you need to have the picture saved on your computer.
Then open Paint

Let's say I took a picture of babv homepage and I want to crop it around the red lines which you can see in the picture below:



How do I do that??
Simply!
Click on the Select button on the toolbar.


After you clicked on that, you hold and drag it around the thing you want to crop.
In our case around the red line. You'll see that:



you'll see that now you will be able to drag the picture:


then right click and click on copy to:


and simply save your cropped picture in a good place on your computer

hope it helped