Tip #1: Spectrazied Weed Stop for Lawns for the Bermuda Grass formula is great for the grass. It's applied with a garden hose and the Henbit weeds will be wiped out. It's easy to get rid of but untreated it will take over the grass and kill the lawns. Let it set for a week then lay down new seed to fill in the bare spots.
Tip #2: Large bags of used coffee beans from Starbucks is a great use of fertilizer.
Tip #3: Ironite from Home Depot or Lowes comes in a big bag and applied to the grass will give them the extra neitrition needed to help grow thicker and greener.
Tip #4: If you're mowing your back yards, it's best to mow at dusk so that it heals overnight and doesn't burn out.