What Is the Difference Between Matter and Radiation?

In the very early universe, everything was massless and moving at light speed. None of these initial particles had mass. You could still have mass by combining particles into some likeb tthe same way. The whole universe was radiation. Then the higgs field broke that symmetry between electromagnetism and the weak force which made a bunch of other particles massive. And then you have matter, and then the electron has mass, and you know, the corks have mass. So we don't know which came first, matter or energy, but we know which came second, which is a radiation, which is really energy et yes.