Mow in a different direction every time the lawn is cut. Improper cutting can ruin your lawn in a heartbeat, while mowing correctly can contribute to a healthy and attractive lawn with fewer weeds. The two things to remember in mowing are correct mowing height and mowing frequency. Mowing too low weakens a lawn. You can improve your lawn's appearance dramatically just by raising the mowing height.
Lawn grasses make their food through a process called photosynthesis.
To do this, they need a good healthy leaf surface. Routinely mowing too low reduces leaf tissue. As a result, the grass eventually starves. So if you mow your lawn very low, and you've noticed a lot of thin areas, now you know why they're there. Something else happens when a lawn is routinely mowed too low, particularly during the hot, sunny summer months.