The best response is:
The benefits are that Aaron will be more productive, which will lead to more output, as well as increased human capital as a result of his videos. The costs to Aaron are the time and money to take the course, along with any forgone income that could have been earned during this time.
This answer captures both the societal benefits and the personal costs effectively. As Aaron enhances his skills through the course, he can produce higher-quality video essays that improve the understanding of economic concepts among his audience, benefiting society. On the other hand, it recognizes that the course requires both financial expenditure and time commitment, which could also result in lost income if he is unable to work during that time.