Changing the opacity of a selection

This is such a simple thing, but as I am a self-taught Photoshop user,
it is something I have never learned to do.

I want to select part of a layer, and then reduce the opacity of pixels
in that selected area -- making them, say, only 50% opaque, while
keeping the rest of that layer 100% opaque. How can I do this?

Greg

.

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