I want to make a grid move on a horizontal plane. I know the wiggle(.4,100) makes it move up and down randomly. But I want to make it move in the background on a horizon. Any help on how to do that. Thanks.
Simply animate it with keyframes?! I suggest you read the help again and begin with teh basics or watch Video Copilot's basic video tutorials...
Make the solid to which you apply the Grid effect WIDER than the comp. Animate the horizontal position. Done.