HOw can In learn about different inbuilt services , recievers and activities in android?

[Rajat Garg3]

I am currently working on cuckoo Droid.. In its report, the software list the different activities,permission, services and receivers .apk file (Whichever I am using) is using. To analyze the report properly I need to get the deep knowledge of inbuilt services permissions and all above stated to work on cuckoo.. Please guide where can I get the same..