01 ADD/SUBTRACT/INTERSECT
With any selection tool, you can add, subtract or intersect the selected area. Most tools display three icons that let you do this, but shortcuts are easier. Shift lets you add, Alt subtracts, and Shift+Alt intersects.
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02 TRANSFORM A SELECTION
You can transform a selection to scale, skew or warp it. Go to Select > Transform to do this. You can then either drag the box to alter the selection shape, hold Ctrl/Cmd and drag to skew the shape, or right-click inside the selected area to choose from different transform controls like Warp. It’s especially useful for tweaking circular selections like this.
03 FEATHER THE EDGES
Selections are initially hard-edged, but it’s easy soften the edge. After making a selection, rightclick it and choose…