Magick does not defy the laws of nature; when it appears to do so, those are only natural laws that the viewer does not understand. Turning into something other than a human WOULD violate physical law and IS NOT POSSIBLE. Many members of this site are strongly against having the fantasy spells section because it misleads beginners into thinking these things are possible, even though the description on the page explains that they aren't. Real magick is a means of using ritual to express intention and manifest one's will in the universe.
Many of the Luck Spells, Love Spells, Money Spells, and Wish spells on this site do work. If you want to learn to perform these spells, you shouold first know the basics of casting (Meditation, Grounding & Centering, Basics of what makes spells work, etc.) You can learn these things with a simple search in the toolbar on the top left corner of your screen.
Hope that helped.