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One important theme in the book is that knowledge is the most powerful weapon of all. This is exemplified in all the ways the themes occur in each of the books:
-At the Dursley’s house Harry finds himself having a rational conversation with the Dursleys explaining Dementors and Voldemort to him. Also, he fully appreciates Aunt Petunia’s (limited) knowledge of the wizarding world. Finally, Petunia gets a howler from Dumbledore indicating more knowledge about magic. In addition, Harry is continually frustrated with the lack of information that he’s getting.
-Once at the Order, Harry is trying to find information in all the wrong places by asking Ron and Hermione. When he finally gets to sit down and ask questions of the Order members, they discuss a “weapon” that Voldemort didn’t have last time. Harry’s mind immediately jumps to something that could kill or hurt people and completely skips the simple notion that there is information that would be an asset to Voldemort.
-In regards to the DADA teacher: Umbridge is constantly feeding everyone false information as directed by Fudge and Ministry. Also, she is suppressing the student’s knowledge of how to execute defensive spells to prevent them from “being trained in combat”.
-The final battle takes place in the Dept of Mysteries which is essentially a laboratory for magical experiments. They explore the effects of time, love, death, and several other mysteries that even magic can’t explain. This place also represents how knowledge is power.