That is a very big topic not many will answer here.
First of all the Queen's Gambit consists of two moves for White, not one move. White must play both 1.d4 and 2.c4 or you have no gambit.
Secondly, the Queen's Gambit is divided roughly into (1) the Queen's Gambit Declined (and Accepted) and into (2) the Indian System Defenses like the King's Indian, Benoni, Benko Counter Gambit, Modern Defense, Nimzo-Indian/ Queen's Indian complex and Grunfeld Defense. Then (3) the Irregular defenses such as the Dutch Defense, Budapest Defense, Chigorin Defense, Albin Counter Gambit and others.
I have tried to break it down into three seperate parts, but you need to be a lot more specific with your questions to gain any knowlede of the queenside openings.
I find queens gambit an interesting opening special when using white pieces. Can you tell some strenght and weakness of the opening move?