In the case of classical mechanics, the Lagrangian approach leads to exactly the same equations. The reason to learn it is that the Lagrangian approach general

In the case of classical mechanics, the Lagrangian approach leads to exactly the same equations. The reason to learn it is that the Lagrangian approach generalizes and is used in nearly all physics[1]. [1] https://en.wikipedia.org/wiki/Lagrangian#Selected_fields https://en.wikipedia.org/wiki/Lagrangian#Selected_fields