A visitor researching almost any federal issue will run into several different kinds of legal authority: a statute, a regulation, an executive order, a court opinion, an agency memo, a form instruction, or a public guidance page. People often call all of these “the law,” but they do not all have the same legal force.

The key question is: what kind of source is this, who issued it, what authority supports it, and can it legally override another source? A statute passed by Congress can authorize an agency to write regulations. A regulation can bind the public if it stays within that statute. A court opinion can interpret or invalidate either one. A guidance document may explain how an agency thinks about the law, but it usually cannot create new binding duties by itself.

Legal authority is layered. The Constitution is supreme. Federal statutes must fit the Constitution. Regulations must fit the statute that authorizes them and must follow required procedures. Executive orders must rest on constitutional or statutory authority. Court decisions interpret these sources and may control future cases through precedent. Guidance can be useful, but it normally sits below binding law.

When sources conflict, the higher source usually controls. A regulation cannot override a statute. An executive order cannot rewrite a law Congress passed. A guidance document cannot impose duties that neither a statute nor a regulation authorizes. A court may set aside a law or agency action if a real case gives the court authority to decide the question.

Each legal source answers a different kind of question. Statutes answer what Congress authorized or required. Regulations answer how an agency implements that statute. Executive actions answer how the President directs the executive branch. Court opinions answer what the law means in a real dispute. Guidance answers how an agency explains its procedures or priorities to the public.

The practical skill is learning to identify the source before relying on it. A helpful agency webpage may tell you what to do, but if you need legal precision you should trace it back to a statute, regulation, official notice, or court decision.

Legal sources often connect in a chain. Congress passes a statute. The statute authorizes an agency to regulate. The agency proposes a rule, takes public comments, and publishes a final regulation. The President may direct executive agencies within legal limits. A person affected by the law or rule may sue. Courts then decide whether the statute, regulation, or executive action is valid and how it applies.

This is why a complete government guide should not isolate “laws,” “rules,” and “court cases” as unrelated topics. They are parts of the same system.

Some sources are legally binding. Others are persuasive, explanatory, or helpful but not controlling. A binding source can create duties, rights, penalties, procedures, or enforceable limits. A persuasive source can help explain the law, but it usually cannot force a legal result unless it is tied to binding authority.

Start with the official source that matches the type of law you are reading. Congress.gov tracks bills and legislative actions. The United States Code organizes enacted statutes. FederalRegister.gov publishes proposed rules, final rules, notices, and presidential documents. The eCFR shows current regulatory text. Supreme Court and federal court websites publish opinions and court information.

Federal law also raises a democratic question: how much detail should Congress write itself, and how much should it delegate to agencies, executive officials, or courts to interpret? More detailed statutes can improve accountability because elected representatives make more choices directly. Broader statutes can let technical experts adapt rules to changing facts.

The tradeoff appears across the whole system. Broad delegation can make government more flexible, but it can also make policy depend heavily on agencies and courts. Strict limits on delegation can make Congress more accountable, but may make it harder to govern complex fields such as health, finance, transportation, energy, labor, and environmental protection.

Knowing the type of legal source helps visitors avoid a common mistake: treating every official-looking document as equally binding. It also helps them find the right place to verify information, comment on proposed rules, challenge agency action, follow court decisions, or understand what a government office can and cannot do.

For public users, this matters in practical ways. A passport instruction, tax form, benefits regulation, workplace safety rule, immigration notice, court ruling, or executive order may all affect real decisions. The best first step is to identify the source, then trace it back to the official authority behind it.