Teachers engage with individuals of various age groups, either children or adults, inside educational environments such as classrooms or other learning settings. Educational environments encompass several options such as public or private schools, charter or magnet schools, international schools, or language-specific schools for non-English speakers in both domestic and international contexts. Elementary, middle, and high school instructors have a crucial impact on the development and prospects of children, providing instruction in academic subjects like language arts and arithmetic, as well as imparting personal qualities such as behavior and discipline. 

Teachers must possess a profound understanding of their field of expertise and possess the skill to proficiently convey their knowledge to others. One of the most important qualities of a good teacher is the love for learning. Teachers should never stop learning new things as they can pass this knowledge on to their students. Learning also helps teachers to stay up-to-date on the latest teaching methods and trends.

A teacher has the option to instruct in all academic disciplines or focus on a specific area of expertise. Kindergarten and elementary school teachers often educate a single cohort of students in a wide array of disciplines, encompassing reading, science, and mathematics. Typically, middle school and high school teachers focus their attention on one or two specialized subjects, such as mathematics or science. Within these broader domains, a teacher may deliver instruction for various courses. For instance, a high school educator with expertise in the field of science may instruct classes in chemistry, biology, and physics. A degree and state certification in the specific endorsement area are necessary.