An FIR records information concerning an alleged cognizable offence and sets the criminal process in motion. It is not, by itself, a judicial finding that the allegations are proved.
For a person named in an FIR, the immediate task is to understand the allegations, the invoked provisions, the factual role attributed to the person and the stage of investigation.
The legal response may differ depending on the circumstances. Bail, anticipatory bail, cooperation with investigation, discharge or other remedies may arise at different stages.
For the complainant too, the quality of the factual material matters. A clear chronology and supporting evidence can help investigators understand the allegation.
The first step should therefore be analysis, not panic: what exactly is alleged, what is the legal provision, what evidence exists and what procedural step is appropriate?