Besides the convenience, I think the best part about my iPhone's camera is the ability to quickly edit the pictures I've taken.
To edit a photo, go to your Camera Roll and select the photo you would like to spruce up. Tap on Edit in the upper right corner of your screen. Here you'll be given several tools to edit your photo.
The various edit options (from left to right on the bottom of your screen) allows you to rotate your photo, auto-enhance it, choose different filters, remove red-eye, or crop your photo.
Tap the rotate icon (an arrow on top of a box) and it will rotate your photo 90 degrees each time the symbol is tapped. It is useful if you accidentally held your camera upside down when you took the photo, or if you just want a different angle.
The auto-enhance feature will give your photos a nice pop in color and contrast. It may be hard to notice on some images that already have nice lighting and color. To use this option, tap the magic wand icon. If you like the enhanced photo tap Save. If not, tap the magic wand again to turn off auto-enhance and return to the original image.
The next feature in your tool bar allows you to choose filters for your photo. Tap on the three interwoven circles icon and you will be given eight different filters to choose from. Tap Apply when you find the one you like.
The Remove Red-Eye icon (an eye with a slash through it) will instinctively blot out your subject's red eyes with a black dot. To do this, tap the icon and then simply tap each red-eye. Click Apply if results are satisfactory. If not, tap eyes again to undo.
Last in your tool bar is the crop feature. Out of all the editing choices, this is the one I use most frequently. Tap the box icon with lines coming out of it. If you would like the image to be a certain size (such as 5x7), tap Aspect on the bottom of the screen. You can choose from popular sizes, including an option to make your image square. Tap Original to go back to the first image. If you'd like to trim the edges of your photo even more, place your finger on the top, bottom, sides, or corners of the image and drag the lines where you want your image cropped. Press the yellow Crop button in the upper right corner to save the changes.