when trevor finished high school, he ended up working "in the hood" for a few years, instead of pursuing his education. when he looks back on why he stayed, he says, "the hood was strangely comforting, but comfort can be dangerous. comfort provides us a floor but also a ceiling." what does he mean by this? how do people get stuck doing something comfortable? what do people need to be propelled forward?

Most people are most comfortable doing what they can do easily, to the extent that they don't want to leave their comfort zone. As a result of this, people get stuck doing something comfortable when they:

Find it difficult to leave their comfort zone

Because of this, the most important thing that people need to be propelled forward is:

Motivation

According to the given scenario, we can see that Trevor was stuck with doing something comfortable after his high school, which was working in the hood which made him not to go to college.

This clearly shows that he was finding it difficult to leave what he was comfortable doing because of how easy it was for him.

As a result of this, the thing which is needed if a person wants to propel himself forward is to have the right motivation which would make him move out of comfort to do something difficult that would be ultimately rewarding.