Heinz Guderian was a person who lived a long time ago and was very interested in tanks. He wanted to use tanks to fight in battles more effectively.
He worked in the army and came up with new ways to use tanks in battle, like using them to surround the enemy's army and attacking from different sides. This tactic is called "blitzkrieg", which means "lightning war".
He also made a special type of tank called the "Panzer". The Panzer was faster, more powerful, and more effective in battle than other tanks at the time.
Guderian was really good at his job, and he became a very important person in the army. He wrote books about tanks and war, and people all over the world learned from him.
However, even though Guderian was really good at using tanks, he worked for a government that did bad things, like hurting and killing people because of their religion, race, or beliefs. This is something that we should never do, no matter how good we are at doing something else.