Answer:
After the end of WWI, Germany was punished with taking responsibility for the damage the war created and they had to pay money to other countries for the damage. Well, Hitler, along with many Germans, were very angry about this punishment. This led to Germany's own "Great Depression". Seeing how much the people were struggling, he wanted to do something about it. At the time, the population of Jewish people was the minority group and used them as a scapegoat. This is where Nazi ideology became a thing which marked Jewish people as "evil witches with big noses", etc. Hitler's main point though was that the Jews were the problem to Germany's suffering and how the Jews were "different" than they were.
Step-by-step explanation:
The Nazi's also wanted to eliminate homosexuals, and other races that weren't seen as "racially-pure"
There are many things that could be said, but this is just some examples. I took a history of the Holocaust class and I could say way more, but I don't think you want a whole book or whatever lol.
Hope this helps you! :)