Teachers bring a different reason, passion, or focus to their careers. You will find many stating that the ability to engage in learning every day is one of the best things about being a teacher. There are technical requirements for educating others that can draw energy from the teaching profession. However, those who have lasted focus on their big reason for becoming a teacher. The greatest lesson most teachers have is how to foster positive interactions with all and at the same time advocate and promote the development of those in their charge. I have heard from my educators that they are "lifelong learners".
The short answer is yes. Many teachers invest significant time and effort in planning and developing their courses. By researching and preparing a course, a teacher gains a deeper understanding of the subject matter and new methods and theories of learning.
In my opinion, what distinguishes a good teacher from a bad one is not only their knowledge of the topic but also their ability to deliver information effectively to their students.
Creating a lesson plan requires several elements, such as a thorough understanding of the subject matter by staying up to date, assessing the students' learning levels and styles, setting goals and objectives that align with the school curriculum, planning the in-class lecture, brainstorming ideas for in-class activities to engage students in the learning process, and developing homework, tests, and other exercises to reinforce students' learning.
Therefore, as a teacher prepares for their course, they engage in a learning process that helps them acquire new information, knowledge, skills, values, attitudes, or behaviors that enable them to become better teachers.
I hope this answers your question.