The most common place I’ve seen them is at ponds. The hover and dart a few inches above the water. They are difficult to catch with a camera — at least for me. But they make it tempting to try when they visit water lilies.
Shimmer. Shine. Do they make you think of flying jewels.
The damsel, while tending to run a little smaller and more apt to fold their wings along the abdomen when at rest — have nothing to fear from the dragon. No knight on a white horse required.