Running without injury

Running without injury.  What an easy and difficult task!
You only need to do a few simple things to run injury free.
Finding this out isn't always easy.
I pulled a hamstring 2 years ago but still managed to run the city2surf from sydney to bondi beach.
Then last year I had a shin splint and ran the city2surf with my leg tapped.
This year I got IT band pain and was almost about to stop running altogether.
Then I found the solution and ran pain free in the city2surf (except for the usual muscle soreness).
Whilst I am still refining the solution, the sad part is that 90% of web sites, youtube videos and professionals (physiotherapists/podiatrists/doctors) only treat the symptoms and don't provide a solution so you end up with more injuries and more pain.