Mulching your leaves saves back breaking work and can be a source of valuable nutrients for you lawn and landscape. However, it can also cause more harm than good if done improperly. The key is to get the leaves small enough to break down naturally without creating too deep a layer that can suffocate turf. This process may require mowing more than once per week at the highest level your mower can be set at. A sharp blade will also help mince leaves without bogging your mower down.
Watch this short video by MSU extension service. https://youtu.be/os-EFAPLcP0