Use CBP.gov when the question is about getting admitted at the border, not filing an immigration benefit with USCIS. It is the official public portal for U.S. Customs and Border Protection, covering inspection at ports of entry, travel document requirements, I-94 records, Trusted Traveler Programs, land border crossing rules, and import or declaration procedures. In the Immigration & Citizenship space, it sits at the entry and admissibility stage: what happens before admission, during inspection, and immediately after arrival.
The fit depends on whether your issue is truly within CBP's jurisdiction. This site is strong for checking passport and visa requirements tied to inspection, retrieving or correcting I-94 travel history, reviewing crossing procedures, and understanding what evidence to carry for lawful entry. It is less useful for green card processing, naturalization, work authorization, or petition adjudication, which usually belong to USCIS or the State Department. If your main problem is confusion at the border rather than a pending immigration case, CBP.gov is the right starting point.
