I've seen a lot of Lightroom tutorials and tips videos; most seem to cover the same few shortcuts. Mark Denney covers some great lesser known features in this video, including a tip for changing the spot removal selection I've never seen before.
The format is very efficient, covering all the tips in under seven minutes. The tips include shortcuts to adjust the feather of brushes, a quick way to view a group of images, and an easy way to visualize Instagram crop lines. Most are keyboard shortcuts, but Denney does a good job of diving into what makes the shortcuts useful. Overall, the tips seem to be helpful in everyday work and cover the primary modules of Develop and Library.
One that I have found useful in combination with his develop shortcut for auto-setting the slider is a second double-click on the slider to clear what has been set. That combination of shortcuts provides a quick way to try out some different settings while easily jumping back to the default.
Lightroom Classic has a lot of depth, and picking up some of these shortcuts will definitely speed up any workflow in the software.