To use a jigsaw, first select the right blade for the material you want to cut (wood blades for wood, fine-toothed blades for metal). Then, with the jigsaw unplugged, insert the blade facing the correct direction and secure it. Clamp your material firmly to a stable surface. Position the jigsaw’s foot flat on the material, ensuring the blade does not touch the material before switching it on. Start the jigsaw at a slow speed and then increase to full speed. Slowly guide the jigsaw along the marked cutting line, applying gentle forward pressure without forcing the saw to avoid blade damage. Use an edge guide or clamp a straight piece of wood to your work surface if you need a straight cut. Let the blade stop completely before lifting the tool from the workpiece. Always follow safety precautions like unplugging when changing blades and keeping the cord clear of the cutting path.