As for the training thing. We don’t really see training from a martial arts perspective in any film.
You see the kids and Luke playing dangerous swingball with laserswords, we see Luke running around with Yoda lecturing to him and we see Yoda guiding a rock levitation exercise. The Cave etc
But the Force abilities these characters have seem to come naturally.
Luke can pull the saber from the snow without being trained by Ben. Luke is shown the concept of using his Jedi foresight to pop the first Death Star but he doesn’t get actual targeting lessons.
Maybe the training is more about controlling the path to expanding one’s natural expansion of powers.
Palpatine and Qui-Gom offered new ‘training’ to fully trained Jedi. So maybe it’s sort of like anger management with magic rather than actual Kung Fu lessons. In this case both Rey and Ren may be strong enough to be able to do these tricks naturally but lack sufficient guidance to focus and control their abilities using their emotions (either by controlling them or indulging them).