This skill is useful as you can take pics of your friends and place them in different places that they have never been! There are a couple of tricks to make your work easier and results look better. I’ve written some notes to accompany this video, but there’s also 2, 3, 4, 5, 6
Import the image, add transparency
Once you import an image it will not have transparency. For this you will need to highlight the layer, colors-> transparency -> add alpha channel. You will notice that the layer name goes from bold to not bold. Duplicate the layer, just in case of a mistake.