What Is Wrong With My Lawn

Question

It started in a small area to turn yellowish brown and is completely dead in a good size area. The rest of the lawn is nice and green.

Answer 1

This can be either fungus or grabs. These articles may help:
https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm

https://www.gardeningknowhow.com/lawn-care/lgen/grass-fungus.htm