There are many kinds of lawn fertilizers. Read the bag and follow the instructions. More isn’t always better.
The numbers on the bag. I.E. 21 7 14. Stands for N P K or Nitrogen, Phosphorous or potasium. or up down and all around. For top growth, root growth and all around disease control.
Remember over fertilizing can burn the plant and make your grass grow more than you want to mow.
Admirable Landscapes in Portland Oregon helps people with their landscape needs.