One of my favorite features in Lightroom for local adjustments is the Auto Mask feature, which can save a ton of time when used in the right situations. This great trick will show you how to get way more mileage out of it to save even more time in your edits.
Coming to you from Signature Edits, this video will show you a helpful trick for quickly creating complicated masks using the Auto Mask feature in Lightroom. In general, if you're working with areas of high contrast or with an appreciable color difference, Lightroom is normally pretty good at respecting the boundaries between different areas, but you still have to paint in the mask manually. This trick takes advantage of the way Lightroom distinguishes such areas and tells it to mask the entire photo based on that method, allowing you to create a pretty decent mask in just one click. The beauty of it is that you can move the pin around and the mask will update automatically in real time. If you frequently need to make adjustments like bringing down the exposure of the sky or masking out the subject, it can be a real timesaver.