system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] With almost no one to train Luke, is he really a guy with the skill level of a Youngling masquerading as a Jedi Knight?
gpt
In some respects, yes.  For example, his saber skills, around the time of his duels with Vader, are rudimentary at best.  He was thoroughly outclassed in their duel on Bespin, and he needed a dark-side-infused frenzy to beat Vader in their duel on the second Death Star.  

However, because Luke had such strong potential in the Force, he could basically make up for his shortcomings in skill.  For example, when Luke was storming Prince Xizor's palace along with Leia, Lando, and Chewie, he found that if he let the Force simply flow through him and guide his actions, he could easily deflect the blaster bolts Xizor fired at him.  (Xizor was notably stunned that anyone could possibly be that fast)  

After the Battle of Endor, Luke more or less had to re-teach himself all of the lost knowledge from the Jedi of ages past.