Resizing for Print?

So, I hear so many different things concerning pixels....

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This is how I resize for print with out changing the Pixel size of my image. You just change the dimension of the image and the distance between the pixels. For example, if your images load to you PC at 48"x72" and 72ppi, then you have a 18mp image (or very close to). Printing an image at this size could turn out grainy and unpleasant. You can change that, by Image>Resize>Image Size and un-check Resample Image In Photoshop and PS Elements. Now Here is where people get confused, How do you change the PPI with out adding or removing pixels?? The answer is both confusing and simple. We will take the simple route. You have a set number of pixels and the only thing you want to change is how close together they are, this also changes the dimensions of your image, but does not change your total number of pixels. Imagine you have an even # of M&M's, and you need to lay them out in a rectangle or square. The bigger your rectangle or square, the further away the m&m's are from each other. This will cause a grainy appearance, or what is called Noise. So we want to arrange these M&M's so that they are in closer relation to each other, the dimensions of the shape will change (so instead of an 8x10 rectangle, you may end up with a 5x7[just and example, most cameras today will make images capable of much bigger prints, so don't let this fool you]) but your M&M's are much closer together, giving you a smooth and beautiful print. You have not added or taken away from your original number, just placed them closer together. I hope this makes sense, and can help clear up some confusion.