Are you sure you were using the brush on the mask and not on the image?
Click on the mask and make sure the mask is active before you start brushing - you'll see a bounding ox around the mask:
Mask active:
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Image active:
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Making a selection is, at its most basic, choosing something. You can use lasso tools, the magic want, the quick selection tool, or moving on, the pen tool.
Then you choose what to do next - mask it, move it, adjust it, etc.
Masking is the act of hiding something. So if you apply a mask to an image, the white of the mask reveals, the black of the mask hides.
I hope I've answered you questions - please let me know if you need more info.
- Jeff
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