When to use what facelet file

hello sir
1. I have developed one project , where different types of facelet pages are created. but i m confused, what is the rule to use these facelet file , different options displays are as :
new Facelet Composition Page
new Facelet Footer
new Facelet Header
new Facelet Template
2. new facelet composition page was created in Web Content folder , while new facelet footer , new facelet header, new facelet template pages were created in WEB-INF folder
what is the concept, tell me sir
Regards
Inam

sorry...yawmark..No prob - I was probably a little harsh, but laziness is rampant here. I've summarized some useful links below:
Java Glossary : interface vs abstract class
Abstract classes vs. interfaces: When does it make sense to choose an abstract class over an interface?
Abstract classes and interfaces practicum: Move from theory to practice on when to employ abstract classes vs. interfaces
Tech Tips: ABSTRACT CLASSES VS. INTERFACES

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