Answer:
Multiple ways.
1.) Propaganda: Propaganda was used to promote anti-semistic, views on the "Aryans"/"master race", and nationalism.
2.) Speeches: Hitler is well-known for his fiery speeches accompanied by screams only dogs can hear. He supported a mob mentality when it came to Naziism.
3.) "Mein Kampf": Written by Hitler while in prison, this book made claims against jews and many sympathetic Germans listened.
Explanation: There are more, but that's a little crash course.
