Protect the Work Surface
When making a cut, you need to firmly hold down the saw to keep the blade from chattering, and even then, it may vibrate a bit. The combination of downward force and vibration is tough on the work surface. Reduce marring by applying a layer or two of masking tape to the base of the jigsaw. Remove the tape when you're done so it doesn't leave a sticky residue on the base.
The main mission of a jigsaw is to cut curves in wood, and it's easy to overlook its other abilities. Instead of slaving away with your hacksaw, grab your jigsaw to quickly cut steel, copper or any metal. You can also cut plastics and tougher stuff like ceramic tile and fiber cement siding. The key to success is to match the blade to the material.