Drywall repair and installation involve several steps to achieve a smooth and seamless finish. For repair, damaged areas are first assessed and any loose or damaged drywall is removed. Then, new drywall patches or pieces are cut to fit the damaged area and secured in place with screws. Joint compound is applied to the seams and joints, followed by tape to reinforce the connection and create a flat surface. After drying, multiple layers of joint compound are applied, sanded, and smoothed to blend with the surrounding wall. For installation, drywall sheets are measured, cut, and attached to the wall or ceiling framing using screws. Joints are taped, mudded, and sanded to create a uniform surface, ready for painting or finishing. Attention to detail and proper finishing techniques are essential for a professional-looking result in both repair and installation processes.