what's wrong with my grass

I live in Green Valley Ranch and someone put fertilizer on the lawn by the handful ( by hand) now I have brown spots is it from the fertilizer plus we just cut down to asphalt trees and next to one of the trees that was cut is bad. what do you think happen and how can I fix it? Also I want to know is this happen to a lot of people in this area, if it is why? Yard 1 is the old grass and yard 2 is how it looks now

The two most possible reasons that I think happened was that the lawn has suffered fertilizer burn from the inconsistent application of fertilizer(by hand). The only remedy would be to water, water, water, to decrease the concentration, then reseed.
The other reason could be an infestation of chinch bugs. Look carefully near the borders of the dead grass sections to see if there are any small crawling insects there. Check this link to see how a lawn infestation looks. http://versicolor.ca/lawns/chinchNOW.html
It also shows a picture of the nymphs but the adults have a darker color.

If I were you I would build some raised beds and plant some vegetables and fruit bushes instead of just have i the area all over to lawn which need so much attention with such little reward.

paul