Analyzing the world with the five themes of geography helps people better understand connections between people and earth because it helps people find out a lot of information about others. It helps them find where others are located. It also helps learn more about others’ religions and manner. For example if your friend lives in another country they might have different culture than you, and you don’t want to be rude by doing something that does not meet their culture's manner expectations.
I think the theme that is most difficult to understand is the human and environment interactions theme. It is the most difficult one because people (including me) usually mix up; using and changing the environment. You really have to perfectly understand every single detail in order to be able to understand which one it is. For example if somebody is cutting down trees in a forest they might be changing the environment but they might also be using it.