Plus as was already stated Luke learned some tricks without any training as well. Who taught him to pull the Lightsaber out of the snow in the cave on hoth? Sure wasn’t Ben. All Ben was shown doing was shooting at him with a remote, which he also seemingly picked up blocking on his own with Ben just giving some general musing about reaching out and such. And he sure seems to have picked up quite a few skills by the start of Return of the Jedi that he didn’t have any the end of ESB and as far as I know he never went back to degobah for more training.
my understanding of Luke pulling the lightsaber out of the snow in Hoth in TESB is: he was completely hopeless and desperate and basically reached out to the force, his only hope. i think he felt the lightsaber and had no idea that he’d be able to pull it using the force, but that he decided to reach out to it with the force nonetheless, simply trusting the force not sure what was going to happen. that’s why it’s such a powerful moment to me. it’s a moment where he believing in the force manages to get himself saved, by doing something incredible, which was pulling the lightsaber out of the snow.
not sure if i was clear enough but i watched a video at some point where the guy worded the way i feel perfectly. i’ll look for it in the future.
and for people saying that Luke mastered blaster deflection within minutes: i think he succeeded at reaching out and stretching out with his feelings to the point of almost seeing the remote, like he and Ben say, which is the very very first baby step one must take. that’s not even close to mastering the skill. the kids in AotC are doing the very same thing he was doing to improve their affinity with the force and i think they did that for hours and days and weeks until they were close to perfect, or totally in line with the force.
plus, Han said in the very same scene Luke deflected three blaster bolts that “good against the remote is one thing. good against the living, is something else”, to which no one replies anything contrary, meaning that everyone agrees with what he said.
so yeah, my interpretation is that that scene was just to show that Luke was starting to tap into the force and was starting to have a new understanding of the world because of the force. not that he picked up the skill of deflecting blaster bolts, which i don’t think he did.
and it’s absurd to me to say that he used the force more than as a guide for his instincts and feelings in the trench run when he blew up the death star.