Naming the lesson's main learning objectives helps teachers achieve optimal learning outcomes. In LessonUp, you can see many lessons with a slide at the beginning indicating the learning objective. Sometimes it's a subject-related objective, and others it is related to the learning process and skills.
The way learning objectives are formulated is a personal choice, but formulating learning objectives from the perspective of the learner is often much more powerful: "You can..." or "I can...".