This summary is not the rule. The rule text controls.
If you're the person making a claim in a lawsuit, whether it's an original claim, a counterclaim, or a cross-claim, you can ask the court to rule in your favor without going to trial. This is called asking for summary judgment. You're basically telling the court that there's no real dispute about the facts, so the judge can decide the case based on the law alone.
You have to wait at least 30 days after the lawsuit starts before you can file this kind of request. However, if the other side files their own summary judgment motion first, you can respond right away without waiting out that 30 day period.
You can ask for summary judgment on your entire claim or just part of it. You're also allowed to file this motion with or without sworn statements (affidavits) backing up your facts, though having solid evidence usually makes your request stronger. This rule also covers situations where you're asking the court to issue a declaratory judgment, which is a ruling that clarifies your legal rights without necessarily awarding damages.