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![to [use] {one's} [head|noodle|naggin]](https://cdn.langeek.co/photo/44770/thumb/350?type=jpeg "to [use] {one's} [head|noodle|naggin]")
to carefully consider the facts of a situation in order to understand something, make a decision, or solve a problem
in a very nervous or frustrating state of mind in face of a problem or situation one knows very little or nothing about
said when one does not have a definite answer to a particular question, similar to the questioner
![to [get|have] the wrong end of the stick](https://cdn.langeek.co/photo/44868/thumb/350?type=jpeg "to [get|have] the wrong end of the stick")
to fail to understand or interpret or understand something correctly
![to {not} [know] beans about {sth}](https://cdn.langeek.co/photo/44878/thumb/350?type=jpeg "to {not} [know] beans about {sth}")
to have no information regarding a particular subject
used when one is incapable of understanding or remembering a particular thing
someone or something one knows very little or nothing about
閉じた本, 謎
used to describe something that is complicated due to not being clearly described or shown
![{not} [know] {one's} ass from {one's} elbow](https://cdn.langeek.co/photo/44844/thumb/350?type=jpeg "{not} [know] {one's} ass from {one's} elbow")
to be incapable of understanding even the simplest concepts
the limits of human knowledge or understanding, representing areas that remain unknown or unexplored
confused and unable to think clearly
![to [wrap] {one's} [head|mind|brain] around {sth}](https://cdn.langeek.co/photo/42150/thumb/350?type=jpeg "to [wrap] {one's} [head|mind|brain] around {sth}")
to fully understand something difficult, complicated, or strange
![to [make] head or tail (out|) of {sb/sth}](https://cdn.langeek.co/photo/61270/thumb/confusion/350?type=jpeg "to [make] head or tail (out|) of {sb/sth}")
to make an attempt to understand someone or something that is puzzling
