Many like to dismiss The Führer's prowess in commanding Germany's armies in the second World War. Hitler was disregarded as a General by the German officer corps. He had not gone through officer school, he had not been a cadet, he had not been promoted to a staff position and done staff work, and he had not played any kriegsspiel (realistic board games the Germans used to play through potential battles at all levels).
This is utter bullshit. The German high command were set in their says and too proud to see the genius of Hitler. They wrote memoirs after the war blaming him for the defeat.
Hitler was the greatest military mind of the modern era. He was prepared to side-step seniority and adapt a good and innovative plan when it was required. See for example Manstein's Fall Sißelschnitt plan for the invasion of France.
He was a risk-taker and would bet hard on small chances and narrow margins. Especially early war this paid off quite a bit. He bet that the French would take more than two months to assemble a serious offensive to relieve Poland, and defended the west with a motley collection of second and third line divisions that lacked much of their equipment. The campaign in Norway was also a prime example of this.
This book, "Hitler and His Generals: Military Conferences 1942-1945". It is a complete stenographic record of his military conferences in this time period. It is nearly 1200 pages long. It shows how The Führer was knowledgable and adept in ALL aspects of commanding his forces, from division level strategy to squad level tactics and even materials and logistics. It also shows how often many of the German generals would doubt or second guess his decisions only to be overruled as they should have been.
Unfortunately I have been unable to locate a digital version and bought this physical copy used online for 5 dollars. It is HIGHLY recommended.
TL;DR Hitler was a military genius and this book proves it. Read it.