What is the point of outdoor home security cameras?

I desperately need security cameras because I don't feel save at my neighborhood but there is this bunch of kids of questionable characters hanging next door and how do I know that they won't use some stick or rocks to knock down my outdoor security camera? What about wireless camera? How do I... show more I desperately need security cameras because I don't feel save at my neighborhood but

there is this bunch of kids of questionable characters hanging next door and

how do I know that they won't use some stick or rocks to knock down my outdoor security camera?

What about wireless camera? How do I replace batteries? Should I use landwire instead?
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