This summary is not the rule. The rule text controls.
A criminal case has to be handled in the county where the crime actually happened. This means if someone is accused of committing a crime in a specific county, that's where the charges need to be filed and where the trial will take place.
There are some exceptions to this rule. Other laws or court rules might allow a case to be moved to a different county under certain circumstances. But unless one of those exceptions applies, prosecutors can't just pick any county they want to bring charges in. The case has to stay tied to the location where the alleged offense occurred.
This rule matters because it protects people from being dragged into court far from where the crime supposedly took place. It keeps things fair by connecting the trial location to the actual events being judged.