I really like baking.  One of the most common things to bake is bread.
Do you know when baking first originated?
I do not know when it was first originated.  I would assume a long time ago though!  I do know in the past baking was typically performed by women in the house.
What are the main baked good that are popular around the world?
Breads are the most common and important foods.  Both from an economic and cultural point of view.  Cake's and pastries are popular as well but bread is by far the most popular.