Dent repair has been a common job for as far back as I can remember.
There were several techniques used in the shop I grew up in but they all lead to the same results.
Reversing damage is more paying attention to the damaged area whether it be a ding or a large dent.
Rushing in to the repair most time will result in more fatigued or work hardened metal, causing you to either work harder or replace the panel.
Best to try to decipher were exactly the initial contact area of the damage and work systematically in reverse.
I always looked at it as the soft and hard side of the damage. Think of it like a train and you pull forward with a big heavy engine and the light ones behind will follow.
The more you work with this in mind the easier the repair.
Keep in mind the panel is still the same shape with or with out the damage, just with the damage it is arranged differently.