i did the crewdrier tutorial to but i have a problem. I dont get the shadows and i dont know how to make the blin background like that. Can someine help me, you can see what i got here:

The tip of the screwdriver needs work but the plastic looks good. You should try lowering the color gain of your HDRI image this will make it less bright.

HDR image or HDRI, not HDRI image...