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Prepositions of direction tell you where to go or where to put something. Prepositions of direction show where or in which direction something moves. Some examples are to, on, onto, in, into, towards, through, etc. are used to describe the direction. These prepositions are most often used with verbs of motion and are found after the verb. The preposition may happen alone or in the phrase in order. 

Important points to be noted:

As prepositions of direction, "at" and "to" are not synonyms. "At" is not common as a preposition of direction, and is only used with the meaning of "towards" or "in the direction of", and then only in some contexts.