Here’s a quick one that you may not know about. If you want to check to see if your blacks and/or highlights are being clipped in an image (you know, the same thing as seeing the BLINKIES on your camera LCD screen), just hit the J key while in the develop module. The clipped, or blown out, blacks will show up in blue and the clipped highlights will show up in red. You can then adjust your exposure, shadow and highlight sliders to bring back the detail in those areas. Also, note that the triangles on the histogram will be in white. Click on either of those (left for blacks, right for highlights) to isolate one or the other.