What are the depths of Yue Fei worth learning?

In order to recover the homeland, unify the motherland and maintain civilization and progress, Yue Fei fought tirelessly in the second half of his life, and still fulfilled the oath of "serving the country faithfully" until his last breath, showing lofty patriotism and national integrity.

At the same time, military talent and the quality of running the army are also worth learning by future generations.