Remove and heal
Remove
Press Q, then paint over what should go: a person, a sign, a wire, dust. When you let go, a local inpainting model fills the area from its surroundings. A click without dragging removes the object under the pointer.
[ and ] (or the scroll wheel) change the brush size.
Each removal is listed in the Remove & Heal section and can be restored with its ×; undo works as for any other change. The original file is never altered.
Heal and clone
Press H, then drag from the blemish to a clean area: the blemish is replaced by that area, matched in brightness (heal) or copied as is (clone). Drag either circle to move it, scroll to resize, ⌫ deletes the selected spot.