What should I do? Import any library? or how to use that templete?
Why the code I learn in playground can't apply in my new xcodeplayground?
Unfortunately, to my knowledge, the methods that you learn in any of the Playgrounds and Playground Starting Points are internal to these learning environments and are purely for instructional purposes. I don't think there exist any libraries that you can import to support the same operations found in these Playgrounds. The XCode Playgrounds only support "real" Swift code.
So for example, if you wanted to make AR things like from AR Create, you actually have to use the methods from ARKit.