A few years ago the shed behind our house was broken into so I started looking at the security of our house. I bought a new steel front door and took the steel front door that was there and moved it to the back of the garage to replace the old wooden door. I had to widen the frame so while I was in there I replaced the door hinge screws with bolts and nuts through the two 2x4's framing the opening then 3" screws holding the door frame to the 2x4's. On the deadbolt side I drilled a hole through the two 2x4's and the next stud over and drove a length of pipe in so the deadbolt went into the pipe rather than just a small striker plate on the door frame. If someone kicked that door they would break their leg before it went down. I then locked up and chained down all my tool boxes in the garage so if someone still broke in that back door they didn't have easy access to tools that could be used to get into the rest of the house.