What is pins of CNC Shields V3 use for?

I don’t understand what is axis cloning use for? Dont need to use it?

My Wantai stepper motor Specifications:

Size: NEMA 17 (42mm x 42mm)

Length: 48mm

Step angle: 0.9 Degrees

Rated voltage: 2.8V

Current/Phase: 1.7A

Resistance/Phase: 1.65 Ohm

Inductance/Phase: 4mH

Holding Torque: 4200g.cm

Number of leads: 4

Rotor inertia: 68g.cm^2

Weight: 366g

I must choose correct jump for mode to follow by stepper motor’s step angle is 0.9 Degrees?