Fixing a lawn involves a process known as 'resodding, ' which is the process of replacing the existing grass with new sod. Resodding is done to improve the appearance of a lawn, as well as to repair any damage that may have been caused by pests, disease, or other environmental factors. The process involves removing the existing grass and soil, then replacing it with new sod. The new sod should be laid in even rows and watered regularly to ensure that it takes root and grows properly. After the new sod has taken root, it should be fertilized and mowed regularly to keep it looking its best.