• VIEW -> RULER: show guidelines
• HOLD + SHIFT + press top layer & bottom layer
• CTRL E: merge layers

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• MARQUEE - selection tool -> select until guidelines
• CTRL C -> CTRL + N (create new photo which is the size of selection) -> CTRL + V

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• if there is white area (to be deleted),
  • CTRL + ALT (double arrow) => DRAG
  • HOLD SHIFT

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• MOVE TOOL + right click: to move text/layer