Lightroom is likely where you spend a lot of (if not the majority) of your time working on images, so any tips that increase your efficiency or control over your images can add up to big time and quality gains over the long run. This helpful video contains 10 lesser known Lightroom tips and features that should be of use to most any photographer.
Coming to you from Jamie Windsor, this helpful video details some hidden tips and features of Lightroom. Of them, my personal favorite is using web collections for clients. As I detailed here, it's even possible to set up web collections as culling galleries for your clients, with the changes syncing right back to Lightroom desktop, making it very easy for you to see and organize client picks and rejects. Another favorite is using the alt key in the sharpening panel. I don't know about you, but it can be hard for me to see sharpening changes as I'm applying them, particularly the masking, but switching over to the alternate view makes it exceedingly easy to dial in exactly the amount I need. Give the video a watch for a bunch of great tips!