If you want to earn money machining, you better know something about this machine motion type.
It was one of the first designed by those crazy mad scientists at MIT.
In its most basic form, the command directs your machine to move the TCP (tool center point) linearly, horizontally, vertically, or diagonally.
With those three motion types, you can have the (c)NC machine move any way you want.
Even the very complex looking multi-axis surface machining you see examples of are primarily built using it.
What is the toolpath type?
G01 = Linear interpolation at a specific feed rate.