Just like humans, the good food we put into our body helps to keep us healthy, so the same rules apply to your lawn. There are many elements that go into an attractive and healthy lawn, with fertilizer being one of them. The 3 nutrients that are required are:
Granular fertilizer is easier to apply accurately as opposed to a spray, as it is tough for non-profressionals to apply a consistent application to the lawn.
Do you want the fertilizer effects to last longer on your lawn? Get a fertilizer with either slow release or control release written on the bag. It typically costs more for a slow release fertilizer but in the long run you will save more as it lasts twice as long as a regular formula. Additionally, it slowly releases the nutrients so the lawn stays attractive and consistent so fewer applications to save you time.