Can you help me understand "Law of Conservation of Matter and Energy”?

Can you help me understand "Law of Conservation of Matter and Energy”?
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Answer :

Welcome to premature enlightenment! You can’t add more energy or mass. All of the heavy elements (e.g., anything with an atomic number higher than lithium IIRC) was created in supernova. We can convert matter into energy (that’s what happens in an atomic weapon), we have a bit more trouble converting energy in to matter (mainly because of the energy involved), but it all has to come from somewhere. What cannot be created or destroyed is the matter/energy (they’re related through E = mc^2), not the objects or people themselves. Dust to dust, and all that.
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