Tips
Hide or lock layer in Scene window
Executing Custom Scripts from Unity's Menu
Hold the Alt button to expand or collapse the Hierarchy
You can search your scene objects by component’s type
Profiling Unity Application with Profiler Samples
You can switch your Inspector into the debug mode
Custom gizmos with OnDrawGizmos
Use icons to see invisible object on scene
Use decorator drawers to improve inspector view of your scripts
Use Debug.Break() to pause Unity editor from the code
Use unitypackage files to share part of your project