Overpronation in Runners

I have commented several times that I like to do a bit of running and one thing I hate is buying new running shoes. They change rapidly and there are 100’s on the market. Every time I go to get a new pair the sales person is an ‘expert’. they all say I ovepronate, but they all say something different about it and a lot of it makes no sense to me. Looking online turned by this stuff that every runner needs to read: Pronation Mythology and The nonsensical understanding of ‘overpronation’, For non-runners, ovepronation is when a foot rolls in wards at the ankle joint when you run. It is supposed to cause injuries in runners.