Here you can find basic tips on how to edit your graphics. Sadly I'm not going to be uploading tutorials since I have a paid program but this can help in any program or app you have.
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Sometimes you need to remove the background from a person or an object. The best way is to use an erase pen and go around it but did you know that there is a website that does it for you?
It's not very accurate at some moments but most of time it is. https://www.remove.bg/ https://www.photoroom.com/tools/background-remover
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to this
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