tyre maintenance

Hello, My car has been punctured. I believe its due to a screw as shown in one of the pictures. I would love to know the right tools to buy and replace it with a spare wheel myself. One of the nuts holding the wheel has a different shape as shown in the picture. My car is a 2008 Ford Focus...

I was reading up online about basic tyre maintenance. Has anyone ever heard about "Tyre Rotation" ? I've never heard of it before. It appears to be something you can do to increase the life and safety of your tyres, but it seems like an awful lot of effort. Does anyone actually do it and have...