Straightening tilted shots

First things first. Our hands are not tripods. They do shake, they do tilt while shooting. So, what to do with those tilted images. Follow the tutorial. It's easy...
1. THE WRONG SHOT
Let's work with this image. You can easily make out this is tilted towards right.
2. RULER RULES THE ROOST

Press Ctrl + R to view rulers. You will see scales on top and left of the image.

From left side ruler click and drag a guideline.

3. FOLLOW THE GUIDELINES
Double click the image layer in layer palette to unflatten it. Press Ctrl + T and rotate to align with the guideline.
Once the image is rotated properly to align with guideline move it inwards by pressing shift and moving so that maximum area is covered inside.
4. FILL THE GAPS
Our image is straight now. Lets clone the rest of hollow area using stamp tool. Select clone stamp tool. Press Alt and click on black area at top. Release Alt key and click on hollow area to fill it.
Clone all four corners.

Here's our straight image.

What...It's easy...well! we told you so...