I plan to go USA this month. can anyone give some travel tips?

One big difference that might exist between your country and the USA is tipping. It's customary to tip people like waiters, taxi drivers, hotel staff, barbers, etc.

If you have any detailed questions about tipping, or anything else, feel free to PM me.

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Have everything booked in advance, transfers, accommodation, rental cars, any tours, internal flights/trains or buses.
Take as little luggage as possible, the weather is cooling off there now so denim is great.
Touring around? They drive on the right so (if you don't normally) take care on the roads. You grow accustomed to it after a while.
Get a book size Rand McNally Road Atlas.
And as the answerer above mentioned, tipping.
Minimum 15% is generally expected. Cabs and restaurants.
Treat everyone with courtesy and respect and you'll have a great trip.