Histograms
You have to stretch the histogram playing mainly on mid-tones and shadows (rarely highlights).
Advice
The mid-tones stretch, while the shadows reposition the histogram to the beginning, to not have a too clear sky.
Warning
Avoid having too much loss of pixels because it is losing information.
Tip
The icon with the toothed wheel allows to transform the histogram in the same way as does the autostetch.
Usually it gives good stuff, but sometimes it clips too many pixels.