RGB  parade 

the RGB parade is where you would adjust colours within a shot so if there was a extreme green jumper on some on you could lower the green influence so its more visually pleasing. 

                                                               VECTOR SCOPE

the vector scope would be used to view the shots colour components percentage and it also provides information on hues and saturation.

 YC waveform

the YC waveform is there to help you make a shot meet the broadcast standard and help with making adjustments with light and colours.