Any work is difficult. Because a person makes efforts, tries, trains willpower (for example, when you already want to rest, but you need to continue to work). There are stereotypes, for example, that mental activity is the easiest type of labor. It’s actually hard to unload sacks of potatoes, but just as hard to write a book. A person makes efforts, overcomes his laziness (no matter what he does).
Labor is assessed by monetary reward: advance payment, wages, bonuses, career advancement.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.