A more thorough explanation:

A point of law is a specific legal issue that is being debated in a case. It is a discrete legal proposition that needs to be resolved in order to make a decision in the case. For example, in a criminal case, a point of law might be whether the defendant's confession was obtained legally or not.

Another type of point of law is a reserved point of law. This is an important or difficult legal issue that arises during a trial, but the judge sets it aside for future argument or decision so that testimony can continue. For example, in a civil case, a reserved point of law might be whether a particular contract is enforceable or not.

These examples illustrate how a point of law is a specific legal issue that needs to be resolved in order to make a decision in a case. Without resolving these points of law, it would be impossible to make a fair and just decision.