me are trying to do a 2D Game (tile map), and me read a lot articles that talk about quadtree are used in order to improve the colliection detection(with deduced the time of collision checking)

although me know the quadtree structure, but totally have no idea to implement it, also no idea how to use in 2D game
and me found no where talk details about it.

can anyone explain deep into it for me, or just provide me some article/tutorial.

thanks a lot for spending time on my question.
and sorry for my poor english.