all the possibilities for the queen gambit

i want to ask about all the possible defences for the queen gambit and how we can react for each defences .thanks 

You are asking a huge question! The possibilities are very numerous, and it is not necessarily the best idea to just go, one by one, through them. My suggestion is find a good book by a GM or IM on playing the Queen's Gambit and read it. Typically each opening has certain "themes" usually concerning key positional or tactical elements that occur frequently within that opening system. This is the correct approach, in my opinion, discover the themes and learn the concepts behind those themes, then look for moves that support the ideas for that opening. Maybe someone else will post some other good advice, that is the best I have, I hope it helps!

thanks !! i'm sorry for my excessive curiosity.. :P  but i just want to learn by asking and searching maybe it's a vague question: )) In fact i'd like know esspecially when the gambit is declined what best solutions for that to keep controlling the center : ))