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).
Prevention and Treatment of Runner's Knee
6 Injury Prevention Workouts for Runners
Hip-Strengthening Workout: The Best Moves to Power Your Pedaling
Knee Strengthening Exercise for Runners - VMO Wedge Dips [Video]
Medial (Inner) Knee Pain Exercises
Common Causes for Your Back-of-Knee Pain
11 Runner's Knee Exercises and Stretches for Recovery
Runner´s knee (ITBS)
13 Top Hip Strengthening Exercises Every Runner Should Be Doing
Patellofemoral Pain Syndrome (Runner's Knee): Exercises