What are whitehat niches? How to earn with them?

I have been targeting blackhat niches mostly and now I wanted to move to whitehat niches now. I don't know where to start whitehat etc. (I tried searching about it but did not found that much good quality of information)
Can someone please tell me what are whitehat niches (give any example), How can I promote whitehat niches with youtube.

If someone can tell me a short summary of things I have asked then ill really appreciate it.
Thanks in advance.

White niches are long time projects. Something like a making a clothing company. You don't want to make fast money, you want to a long term brand. Do seo that will stay. Make quality youtube videos by building up a quality profile for example.

Correct me if i'm wrong