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Origami often share common folding bases. Many diagrams start directly from a base. Therefore, it is important to know them.
The Preliminary Base
As its name suggests, the preliminary base serves as a foundation for other origami bases. It combines two mountain folds along the diagonals of the square with two valley folds along the medians of the square.
The Water Bomb Base
This is the inverse of the preliminary base:
The Kite Base
The Fish Base
in 3D 
The Bird Base
The Frog Base
The frog base starts from the preliminary base:
The Box Base
The Diamond Base
The Windmill Base
