The answer to 'sod bare spots' is that there are several common causes, including heavy foot traffic, poor soil conditions, drought, and disease. Symptoms include patches of dead or thinning grass that expose the soil. To fix bare spots, the best solution is to resod the affected area.
Resodding is generally a DIY-friendly task, but it's important to properly prepare the soil, choose the right type of sod, and ensure proper installation and maintenance. However, for large or recurring bare spots, or if the underlying cause is unclear, it's best to consult a professional landscaper who can diagnose and address the root problem.