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Provided you're using an appropriate starter fertilizer for grass seed, you can put down seeds and fertilizer at the same time. However, putting them down separately, one after the other, on the same day will help to avoid over- or under-applying the lawn food. Avoid using a fertilizer with weed control elements, as these will likely keep the grass seeds from starting.  

One of the most effective ways to improve lawn absorption is to learn how to aerate your lawn. This is a process where you poke tiny holes all throughout it to break up tough soil and sediment, creating pathways for sunlight, water, air, and nutrients to seep into the plant’s roots. In turn, it promotes stronger root systems, making your lawn or plants less susceptible to pests and disease. Ideally, you’ll want to aerate your lawn at least once per year during the growing season—think late summer to early fall. 

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.

In the fall, you should aerate the soil, overseed the bare spots, kill weeds, mow the lawn low, and rake your leaves. By boosting your lawn’s health in the fall, your grass will be stronger throughout the winter and come back healthier in the spring. You should also trim your perennials so that they withstand the winter and are ready for new growth in the spring.