make head or tail of sth

از سر و ته چیزی سر در آوردن
سر و ته چیزی را فهمیدن
Tom wrote me a note, but I can't make heads or tail of it. His handwriting is so messy
تام برایم یادداشتی نوشت، اما نمی توانم سر و تهش را بفهمم. دست خطش خیلی نامرتب است

likely originated from the idea of trying to decipher or understand a complex situation or information. In this expression, "head" and "tail" symbolize the two ends of something, and trying to make sense of it implies the effort to grasp the entirety of a situation.
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از چیزی سر در آوردن ( معمولا در جملات منفی )