Nowadays, teaching students to think critically and developing their critical skills is one of the most important tasks in education. Along with critical thinking, there are skills such as critical reading, critical writing, and critical listening as related concepts. A number of our scientists give opinions that it would be appropriate if the text and exercises in the textbooks, educational literature, training manuals were created not only focusing on language learning, but also taking into account the development of students' critical thinking. This article provides detailed theoretical information about critical thinking and critical skills and their importance, as well as the opinions of several scholars about them.