To hang heavy wood art on a wall, you will need a sturdy wall anchor or a French cleat. First, find the studs in the wall using a stud finder. Next, attach the wall anchor or French cleat to the back of the art piece. Finally, attach the other half of the wall anchor or French cleat to the wall, making sure it is securely fastened to the studs. If you don't have studs and instead have block or brick walls, just bang it in and you're golden, taking care to avoid mortar lines and getting the wall anchor into solid brick/block.