I've been caught by a quite interesting statement of Berkeley physics Course Vol.1 (Chap. 5), that says "In the physical world there exist a number of conservation laws, some exact and some approximate. A conservation law is usually the consequence of some underlying symmetry in the universe.". I made a quick search on internet and found that a good thing to understand best this relationship between symmetries in a physical system and conservation laws, is the understanding of the so called "Noether's Theorem". I'd like to know if anyone has a better suggestion. My specific desire is to be able to identify which symmetry causes that particular conservation and why (for ex. I know the homogeneity of space is the cause of the conservation of linear momentum, but I haven't think about why). Thank you! Luke.