These are the two videos that have really helped me:

Gentle Fitness by Catherine Joppa
https://vimeo.com/219096246

Band Assisted Stretch
youtu.be/lEJbIvHNXaI?t=220

I've personally never found "static stretching" to be beneficial for me. But more advanced stuff involving moving the limb while using it has been helpful to me. I screwed up my leg and hip stupidly doing exercises with heavy weights and squats, and I've known several coworkers to also seriously injure themselves with it, so I don't recommend that.