The German people had some advantages throughout the Battle of Stalingrad. For example, the German army had the element of surprise because of its strategy during the war. The Germans fought using a Blitzkrieg style of warfare, which meant that they attacked the point where the enemy was least likely to expect them to attack. So, this allowed the Germans to have the element of surprise during the Battle of Stalingrad because they could have attacked any weak point that they found in the Soviet defenses at any time they wanted to while the enemy thought that they were attacking somewhere totally different.
The German army also faced many disadvantages during the Battle of Stalingrad. The German army was not close to any of its supply sources during the Battle of Stalingrad. The German army did not have a lot of some supplies, such as gas, and resources as scarce as gasoline were given to groups of soldiers that were the highest priority during the war. This would have left some German vehicles as easy targets for an airstrike coordinated by the enemy. Also, since the Germans were not near any of their supply lines, they could not get a lot of food. The majority of German troops were either surviving on very little food or no food at all. So, the troops could not get a lot of food or supplies when they needed them to help them survive the harsh Russian winter.
The German army's strategy during the Battle of Stalingrad was to surround the city of Stalingrad and attack the soldiers inside until German forces controlled the whole city. This strategy worked for a while, but was not enough to win Germany the battle.