One of the most common mistakes people make is leaving their garage door remote inside their car. Thieves and burglars break into your vehicle and take the remote giving them direct access to your home. The best way to prevent this from happening and still have easy access is to simply purchase a keychain style remote.
Another important thing to keep in mind is to keep the door locked between your garage and your house. Using a reliable lock such as a deadbolt can be good. Also make sure the door from the garage to your home is as sturdy as your front door. A steel door is the best and anti kick devices are also recommended.
The key here is by not making it easy for burglars to break into your garage by never forgetting to shut your garage door when going to bed or leaving your home. This gives them free access to anything in your garage and if they shut your door behind them plenty of time to also break into your house without being seen.
If you do have windows in garage door or side windows in your garage be sure to get obscure glass or frosted glass to prevent thieves from looking in to see what good stuff you have to offer or more importantly if someone may be home or not. Keep expensive items like golf clubs, bikes and power tools out of site.
For more on garage security tips, click here: http://www.safewise.com/blog/6-tips-securing-garage