Adobe Photoshop is a very powerful graphics editor designed primarily for processing raster images. Let's take a look at the easiest way to replace the background of an image using the Magic Wand tool.
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Open the image for which you want to change the background in Photoshop. Select the Magic Wand tool from the toolbar.
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Move the mouse cursor, which will be a magic stick, over the area of the image with the background. Left click. A selection is formed.
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Next, move the cursor over the selected area, right-click and select "Invert the selected area".
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A new selection is formed, but not the background, but the image itself will be selected.
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Press the key combination "Ctrl + C" to copy the image to the clipboard. Open a new image with a background and paste a selection from the previous image using the combination "Ctrl + V". Scale the image if necessary. To do this, press "Ctrl + T", a frame with squares at the corners and edges will appear.
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Hold down the "Shift" key (needed to maintain proportions) and drag any of the corner squares. Select the desired size and confirm the scaling by pressing "Enter". As a result, you should get something like this:
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Note! The presented method is the simplest and can be effectively applied only to images with a monotone background.