3/5
If you’ve got a fenced-in yard but worry about your cat climbing over, a fence conversion system like this one by Easy Pet Fence is a good solution. It screws in easily and covers 100 feet of fence.
4/5
An above-ground fence isn’t always a feasible solution. If that’s the case for you, try an in-ground fence like this one by PetSafe. Establish a perimeter where you want your cat to stay, then attach the cat collar to your cat. When your cat nears the fence, it will hear an uncomfortable tone discouraging any further exploration.