Lightroom’s masking Brush tool is incredibly useful, and its Auto Mask feature, which helps to keep you “painting inside the lines” (so to speak), makes it even more helpful as it tries to “sense” the edges of areas where you’re painting with the brush to keep you from accidentally painting over something you didn’t want to paint over. Here’s an example: In the image above, I want to brighten just the column in the back on the left side (it’s kind of buried a bit in the shadows), and the Masking Brush would be perfect for this, so you would click on the Masking icon, then choose ‘Brush’ from the list of masking tools that appears. I increased the Exposure amount to +2.45...