The first advanced post-processing technique that we are going to see is the basic star reduction.
With this technique, we will be able to reduce the size of the stars in order to have cleaner photographs. We will see more nebulae and details in the Milky Way, as well as colors that would otherwise go unnoticed. This process also helps to have an image with the feeling of less noise.
This is the basic star reduction, which should be applied carefully in order to avoid artifacts. For better results, I recommend doing the Advanced star reduction explained in the Pro Milky Way Course.