Lots of fancy way to do it, but the quickest, and I sense from your "no jargon" post, is to use a flash (USB thumb) drive to move things over.
How to copy *only* pictures?well, in a perfect world we just voice command SIRI "transfer only my pictures!" unfortunately we haven't advanced that far just yet, so you need to know where you have saved all your pictures, CHOOSE AND COPY, and hopefully you know about file extensions and file types, that's how you know they are pictures.