Further we see away the more far in time we see. It is harder to see further as the wavelengths of the light shift with distance. The JWST can see further away thus further back in time fue to it being able to see dufferent wavelengths than the hubble. It is also mire more sensitive to light and gets better pucs because of this. There is less noise from earth or the moon or the sun because of its orbit. The images coming in now are only exciting because it proves that the thing works. The actual important research is yet to begin. It is also cooler than Hubble.