Essential Things to Know Before Visiting the USA 1. Passport and Visa Requirements: All visitors to the United States must have a valid passport and, depending on the purpose and length of the visit, may need to obtain a visa before entering the country.

1. Currency: The United States uses US dollars as its national currency. Credit cards are widely accepted in the US, but it's still a good idea to bring some cash for small purchases.

2. Language: English is the de facto language of the United States, though Spanish is also widely spoken in certain areas.

3. Transportation: The US has an extensive network of highways, airports, and public transportation systems, so getting around is usually quite easy.

4. Accommodation: Hotels, motels, and other forms of accommodation are available in most areas of the US, though prices can vary depending on the location.

5. Tipping: Tipping is expected in the US, especially in restaurants and for services such as hairdressing and taxi rides.

6. Weather: The climate of the United States varies greatly depending on the region. In general, summers are hot and humid, while winters are cold and can be severe.