This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule:
If you lose part or all of your case, you have the right to appeal, but only in certain situations. You can appeal a final judgment, which means the court has completely wrapped up the case and there's nothing left to decide. You can also appeal certain other orders the court makes along the way, as long as the law says those orders can be appealed.
This rule doesn't let you appeal every single decision a judge makes during a case. Many rulings happen before the case is finished, and those usually aren't appealable right away. You typically have to wait until the whole case is resolved, unless the specific order you're upset about falls into a category the law allows you to challenge immediately.
The main point is this: not every court decision can be appealed right when it happens. You need to know whether the ruling you disagree with counts as a "final judgment" or an "appealable order" under the law before you try to take your case to a higher court.