A resource location object is used for telling minecraft where to find something. It consists of a domain and a path.

If you don't want to type out the package's whole name every time you use a static method or if you are encountering any issues with the class in general it might be required for you to import the class:
import mods.contenttweaker.ResourceLocation

Static methods are those that are called on the package itself, not on any specific object of this instance.
You can use this method to create a new CTResourceLocation instance:

ZenScript
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var instance = mods.contenttweaker.ResourceLocation.create("contenttweaker:item/myItem");

ZenGetters are called on an object, not on the package itself

ZenScript
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print(myLocation.domain);

ZenGetter	Type
ZenGetter domain	Type string
ZenGetter path	Type string