When I was started to learn JavaScript from scratch I found one of the best tutorial resources from thenewboston.com (Bucky Roberts). I guess there is nowadays many good tutors in YouTube. But Bucky was the first one that came to mind... and he is also quite funny guy while he teaching...
There is "Introduction course for JavaScript" in for https://thenewboston.com/videos.php?cat=10 I found that course very good at the beginning. It's from year 2011, but still good theory I guess.