In denial? Afraid to do your homework? Want to learn more about the facts? Start with the links below:

"Wannsee Conference

On January 20, 1942, Heydrich invited key officials from various Reich Ministries to a conference at a villa on the Wannsee, on the southwestern edge of Berlin. The ministries included the Foreign Ministry, the Ministries of Justice and the Interior, and civilian occupation officials in the Government General and the Reich Commissariat Ostland. At this Wannsee Conference Heydrich presented plans, authorized by Hitler himself, to coordinate a European-wide “Final Solution of the Jewish Question.” He informed the participants that Hitler had both authorized the physical annihilation of the European Jews and had designated the SS—specifically the RSHA under Heydrich—to coordinate “Final Solution policy.” He impressed upon them the need for active participation of their agencies to guarantee the ultimate success of the operation. (Source: https://encyclopedia.ushmm.org/content/en/article/reinhard-heydrich-in-depth)

Massive Killing Operations Begin

On July 17, 1941, four weeks after the invasion of the Soviet Union, Hitler tasked SS chief Heinrich Himmler with responsibility for all security matters in the occupied Soviet Union. Hitler gave Himmler broad authority to physically eliminate any perceived threats to permanent German rule. Two weeks later, on July 31, 1941, Nazi leader Hermann Goering authorized SS General Reinhard Heydrich to make preparations for the implementation of a "complete solution of the Jewish question." (Source: https://encyclopedia.ushmm.org/content/en/article/reinhard-heydrich-in-depth)

Killing Centers

In the autumn of 1941, SS chief Heinrich Himmler assigned German General Odilo Globocnik (SS and police leader for the Lublin District) with the implementation of a plan to systematically murder the Jews of the Generalgouvernement. The code name Operation Reinhard was eventually given to this plan, named after Heydrich (who was assassinated by Czech partisans in May 1942). As part of Operation Reinhard, Nazi leaders established three killing centers in Poland—Belzec, Sobibor, and Treblinka—with the sole purpose of the mass murder of Jews. (Source: https://encyclopedia.ushmm.org/content/en/article/final-solution-overview)

Links for further research:

There's also testimonial evidence provided at the Nuremberg Trials. https://encyclopedia.ushmm.org/content/en/article/the-nuremberg-trials

Concentration camps have been preserved just for doubters like you. https://encyclopedia.ushmm.org/content/en/article/auschwitz-1?series=21818

Zyklon B canisters at concentration camps? Why? http://www.historyplace.com/worldwar2/holocaust/h-zyklon.htm

The Timeline http://www.historyplace.com/worldwar2/holocaust/

Mein Kampf and Rally Speech evidence https://phdn.org/archives/www.ess.uwe.ac.uk/genocide/statements.htm

Then there's the photographic evidence that the Allied troops made while liberating the concentration camps. https://encyclopedia.ushmm.org/content/en/gallery/liberation-photography

Read the Nuremberg Trial transcripts.