1. Gestures have different meanings: a gesture can be polite in one country but rude in another. That's why it's important to learn about the culture.

2. Gestures can cause problems: something simple like shaking hands or pointing can look disrespectful if you do it the wrong way.

3. Not all gestures are the same everywhere: For example, the thumbs-up sign means "good" in some places, but in others it can be offensive.