This summary is not the rule. The rule text controls.
Every time court breaks for the day (or takes any recess), the judge has to remind the jury about their responsibilities. The judge must tell them not to talk about the case with each other or with anyone else. This applies whether the jury goes home for the night or stays together under supervision.
The judge also has to remind them not to form any opinions about the case or share any conclusions before all the evidence and arguments are finished. This rule exists to keep jurors fair and open-minded until they've heard everything they need to make a decision. Jurors are only supposed to start discussing and deciding the case once it's fully handed over to them for a verdict.
This reminder has to happen at every break, not just once at the start of the trial. It's a repeated safeguard to make sure outside conversations or early opinions don't affect the jury's final decision.