Example of a Post Type of Gallery in WordPress – this will automatically gather any attached images to a post and display them as a slider both here on the blog index page and also the individual post page – also note that if your category for the homepage loop is chosen, your gallery images will be displayed in a slider as well.

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Insanity: doing the same thing over and over again and expecting different results. -Albert Einstein

WordPress Standard Gallery With automatic built-in Light Box