If you've ever used a 3D editor, then you've most likely used a certain thing called "Gizmo", Gizmos are essentially transformation modifiers that's within a world, they let you modify the object's position, orientation and scale. The implementation of a Gizmo is actually fairly straightforward for the most part (or may not be depending on how your application handles things internally, but at the fundamental level it's simple).
This article would only cover Translations and Rotations, Scaling is very easy to implement after understanding how the first two work. And also this may give you a hint into how Blender's robust implementation of Gizmo works as well!
