I recommend (YouTube) "Porzak Golf". As A 50+ year golfer I can easily relate to his instruction. Essentially you are just watching a pro giving a lesson to a golfer and the focus is on 1 flaw. All the videos are shot outdoors on a range; the production quality is excellent. I watch them even if the focus is on something I am not struggling with. His explanations are excellent and oftentimes the Ball tracer is used so you can see the shot. Give him a watch, you won't be disappointed. I am following just about all the top notch online instructors and firmly believe he is the best.