Why when I put the Selection Colorization with Black and White, I need put Black in the RGB tab?

I was watching the tutoarial about Photoshop, and when he talked about Selection Colorization, I didn't understand why he put Blach in the RGB tab! Can anyone tell me, please?

I'm not exactly sure what you mean, but I watched the video and am guessing that you are asking why he "paints" with black on the layer mask.
White (visible) and black (invisible) define visibility of the layer, in this case a Black & White layer. So when he paints with black on the lighthouse, the Black & White layer becomes invisible in those areas, letting the color show through.
For more information, see this page.
Hope this helps,
Randy Nielsen
Learning Content Manager, Creative Cloud Learning
Adobe

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Why when I put the Selection Colorization with Black and White, I need put Black in the RGB tab?

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