Retrograde planets?

Someone please explain these to me. Are they not as strong or do they come into play later in life?

@HarleyTwinFlame-

There is Mercury retrogrades
There is Venus Retrogrades
There is Mars retrogrades
There is Saturn return or retrogrades

All of 4 help one define what life is all about, what they have endured over the years, what they can teach others about that have no idea what should be accepted or not, what types of people do we need to have in our lives, and what type of behavior comes out in these retrogrades, and can even help you get out of really horrible situations..