The Content-Aware Crop Tool in Adobe Photoshop is super helpful when you need to extend the sky out further at the top of your image or straighten out a slanted horizon.
Content-Aware cropping is not a feature that you are going to use on every image, but as you will see in the video tutorial below, the Content-Aware option makes this kind of image repair much easier. With Content-Aware Crop, Adobe Photoshop CC 2015.5 looks at the pixels around the edge of your image when you expand, or rotate the image, and it automatically fills in the blank space that gets created in the cropping process with a computer generated pattern.
You can use this tool to move the horizon lower in an image by adding more sky, fill in the corners when you rotate an image, or change the aspect ratio by adding content around the edges of your image. As you will see in the tutorial above, I will adjust my usual Adobe Photoshop Lightroom Classic to Adobe Photoshop workflow to extend at least one edge of my image out further before I rotate, or straightening the image, to preserve vital details.