In many, many genres, you'll often take a shot that's great save for a rather bland sky. When that happens, you can turn to a sky replacement in Photoshop. This great video will show you everything you need to know to make it convincing.
Coming to you from Jesus Ramirez of the Photoshop Training Channel, this helpful video will show you everything you need to know about sky replacements in Photoshop. While you might think of this as something landscape photographers would do, it's a useful skill for almost any photographer who shoots outside to have. For example, if you're a wedding photographer, you don't get to wait for a great sky for your couple, and you might find that replacing it can really complete a portrait. It goes beyond just properly masking in the new sky, though. Doing things like matching the color can go a long way in making your edit look convincing and natural. Once you get the hang of it, it's not a particularly difficult thing to do, and I personally think it's one of the most useful skills a photographer can have in their bag of tricks. Check out the video above for the full rundown.
I have been taking as many images of the "sky" as possible. Apart from the colour matching issue, it also makes the image copyright issue a straight forward matter.
Can we have written articles along with the videos with the explanation. Some people don't learn well from videos.