A drywall patch can be commonly done with a patch kit; a "California" patch; or a patch with a support board. I test all three methods.
USG Plus-3 Joint Compound 3.5G Box
12X12 CALIFORNIA DRYWALL REPAIR PATCH
Patching Drywall: 10 Tips & Techniques For Repairs
12X12 CALIFORNIA DRYWALL REPAIR PATCH
How to Patch and Repair Drywall
Fix-It Chick: Pick Out The Right Spackle For The Job News,, 56% OFF
Easy 6 Drywall Tips & Tricks To Fix Any Hole And Damages! DIY
Projects - Page 2 of 5 - granworks
How-to patch a receptacle or hole in drywall.
Projects - Page 2 of 5 - granworks
How to Patch and Repair Drywall - The Home Depot
How to Patch and Repair Drywall
Drywall Tools Bundle of Mark N Guard Accurate Drywall Outlet
How To Repair a Hole In Drywall - California Patch
How to Fix Holes in Drywall - 4 Easy Methods