What did Luke Skywalker do?

Answer 1

*SPOILER*

That depends on which episode you are talking about, but some memorable doings are as follows:

In A New Hope:

Becomes the Apprentice of Obi-Wan Kenobi

Saving Princess Leia

Blowing up the first Death Star

In The Empire Strikes Back:

Getting kidnapped by a Wampa and almost dying

Fighting in the battle of hoth

Going to Dagobah to learn to be a Jedi

Fights with Darth Vader, his father, and loses his hand

In Return of the Jedi:

Helps Leia and Han on the fourth moon of Endor

Gets kidnapped by Ewoks

Redeem his father back to the good side

In Legends (The alternate universe!):

Briefly fell to the dark side but came back, thanks to Leia

Freed Mara Jade from being evil, then married her

Started The New Jedi Order and became its first Grand Master

Had a kid named Ben Skywalker with Mara and named him after Obi-Wan Kenobi

Taught his nephews and niece the way of the Force

Went into exile after his nephew, Jacen Solo, dies