I am interested in finding out about how feature class is used in a geodatabase.
I know the definition, the theory behind a feature classes but not really comprehend the use in the Geodatabase.
List of polygons are a polygon feature class. How are they collectively used? What edits can be made to a feature class.
Those are some of questions I have.
You're asking some very wide-ranging questions, almost on par with, "what is GIS?". You're best source of information is the ESRI help (e.g. A Quick Tour of Geodatabases).
A one-sentence answer is: geodatabase feature classes are like other spatial files (e.g. shapefiles), with extra functionality, like topology, networks, domains, relationships, etc.
I realize your original post is pretty old, but since you recently replied back to this thread, you may find this article useful:
Hope this helps,