The primary objective of the training process is to discover a function that takes into account a pixel’s position (X, Y, and any other activated inputs) and produces a color (a set of 3 RGB numbers) based on the given data points. These data points refer to the “example” points, represented by dots that can be placed using the color selector buttons and left-clicking to add new points. The right panel provides an option to clear these points.
(I hope this helps!)