The body language in the US has different meanings than is Japan or the UK.
Putting your thumb up is saying good job, and putting up your hand and waving it means hello! Some body language in the US might be offensive for where you live. Some body language can help you with school, as to some can be sexual. If you live in Japan, the question sign, or putting your pinkie up, can be a sign of the middle finger in the US. That pretty much concludes body language acts.