The popular "weak hips" theory is weak: it’s super unlikely that weak hips are a cause of runners knee (IT band pain or patellofemoral pain).
Strong Knees for Running
Treating Runner's Knee - How to Address Knee Pain
What strength training exercises help with managing runner's knee? - Quora
How to Exercise With Knee Pain — Somerset Hills Chiropractic
Prevention and Treatment of Runner's Knee
Hip Flexors and Running
Hip-Strengthening Workout: The Best Moves to Power Your Pedaling
Daily Core Workout
Patellofemoral Pain Syndrome (Runner's Knee): Exercises
The Power of Knee Strengthening Exercises to Relieve Knee Pain
Is running bad for your knees? Research shows impact on marathoners