Final answer:
Congress.gov is an essential resource for finding current and past US federal legislation, while LibreTexts provides updated information on Supreme Court and appeals courts cases.
Step-by-step explanation:
Resources on up-to-date legislative changes can be found on the official US government website, Congress.gov. This website provides comprehensive information about federal legislation, both past and present, and also details of the US legal system. Moreover, information about current US legislation that could impact individuals, and details on current legislative branch representatives, can be discovered on this platform. An additional resource for updated legal information is LibreTexts™, which is maintained regularly and offers insights into cases heard by the Supreme Court and other appeals courts.