Beware of cold Bridges

I am learning quite a lot. It is actually not enough to insulate some walls you have to insulate all of them. And don't forget the floor and the roof. It is a bit like a teapot cozy. But beware:  If you leave just one gap open, the cold will squeeze into it with all its mighty force. They call it 'cold bridge'.
My house is actually a collection of cold bridges.