に

に is a particle with many uses. When used as a location or "target" marker, it marks the destination or "target" of an action. This means that we can mark a noun as the target of an action by simply attaching に to it.

When the noun に attaches to is a destination, the action should be a verb of motion such as 行いく, 来くる, or 戻もどる.

When used in combination with the verbs ある and いる, に marks the location of something's existence.

When used to mark the general "target" of a given verb, に marks where something is put, or where there is a point of contact.

Summary

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  The に particle can be used as a destination or "target marker"

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  This usage of に attaches to nouns

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  に is commonly used in combination with verbs of motion and existence