Move, Rotate, Scale
The three basic operations for manipulating objects and components (G, R, S).
Move, rotate, and scale are the three fundamental transforms in 3D. In Blender they live on G (grab), R (rotate), and S (scale), and work the same on whole objects in Object Mode as on components in Edit Mode. Nearly every modeling action reduces to some combination of these three.
Related: Modeling · Operation Panel
These fundamentals are covered hands-on in Blender Geometry Essentials 01, free with a free account.