How to secure driveway, garden, yard and against illegal intrusion?

You need to get it through your head that you can't buy security. You can go to a security store and talk to a security representative and he will sell you a security system but you are not buying security: you are only buying equipment. You might spend a thousand bux on a magnificent front door with a real fancy lock. Well, ponder how much damage a burglar has to cause before he qualifies to set off your security system. The dealer refers to that system as "an annunciator". Did you ever walk into a store and hear a bell ring in the back room? That is what an annunciator does: it announces that someone has entered the property.

Another problem is that anything you do to "secure" the outside of your house is about like putting up a sign saying "I've got something worth stealing!" The only exception is roll-down steel shutters over the windows. They don't send signals the way bars do.

Any discussion of security has to begin with a definition of exactly what you want to protect, and the best protection is usually just not telling people that you have any such thing. I know a fellow who has several hundred thousand dollars worth of precious metals. He keeps them in old paint buckets in his garage, with nuts and bolts and Christmas ornaments on top.