Why are people protesting against Donald Trump?

What is the actual main reason?

Don't say "He's a misogynist, he's a racist" or all those other childish words. In a true, educated, statement explain why, specifically are people protesting Trump?
Update: @FLSwampBoy: Right! Because all you can think of is childish insults, you're no different than Trump yourself.
Update 2: @Wise: Thanks. This was very detailed. And has he actually supported people who call themselves Nazis? Do you have any source to this? I'm not disagreeing with you, I just want to be sure.
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