these are tools to help you understand what your instructor is talking about and not for training. Consult A certified flight instructor for lessons. All of the maneuvers your instructor has you perform will come together to help in different phases of flight, slow flight is part of a series of maneuvers for landing the aircraft.
Here is a quote from AOPA.
We often hear that aviation’s value to society is speed; but first, pilots must learn how to fly at very low airspeeds. The FAA’s Flight Training Handbook (Advisory Circular 61-21) discusses minimum controllable airspeed (MCA), but the current private pilot practical test standards (PTS) calls it what it is — slow flight.
Next we have a few videos from from Youtube.