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Hello

until a few months ago, I was feeling fairly competent with Photoshop, was repairing old photos using clone tool content aware fill etc. but I tried some thing basic today, and just can’t get my head around it. I need to copy a section of photo, a border, mirror it, paste to a different place on the same image, and adjust it to look right. My first attempts kept saying the selection was empty, then when I flattened the image ( no idea if that was the right thing to do, I could copy and paste, but couldn’t see where the selection was ?

Could someone kindly give me the steps to achieve this ? I realise for most of you it’s like teaching grandma to suck eggs, but would like to get to where I was before. Secondly, is there a, preferably free, tutorial, to go over the basics such as this, thanks in advance.