No. Luke never turned to the dark side. Only his father did.
Of course, that's only true if you completely ignore the extended universe comics and novels that not only feature Luke turning to the dark side once a resurrected Palpatine appears, but had him breaking free and becoming a full Jedi master by way of the experience.
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After he lost his Uncle Owen and Aunt Beru to the Stormtroopers, he decided that there was nothing else for him on Tatooine, so he went on the journey with Obi-Wan.
Luke does turn to the dark side. But then gets saved by his sister leia when she becomes a Jedi. Read or listen to dark empire that is the whole story. Luke turns back and makes a Jedi academy were he trains the future Jedi order on yavin 4
It could be argued both ways. But directly he did not. He convinced his father to come back to the good side. When he did Darth Vader killed the emperer. That caused Darth Vader to die because it was only through the emperer's power that he was being kept alive. He was injuring by lava in his fight against obi whan. So when he killed the emperer Darth Vader died. So technically nobody killed Darth Vader he just died. However it also could be argued Luke is to blame. If he had not convinced Darth Vader to come back to the light side of the force he would not have died.
Revenge of the Sith focuses on Anakin's turn to the dark side and becoming Darth Vader
star wars theme song(of course)"unknown"my little buttercup turn the ship around and where are the cowboys gon
There are 5 A) Two point turn, backing on the right side B) Two point turn, pulling in on the left side C) U-turn D). Three point or "K" or "Y" turn.