From the Battle of Yavin to the Battle of Endor, Obi-Wan spent about 4 years as a Force Ghost.
Throughout these 4 years, we only witnessed him (in the movies) speaking to Luke from thin air a couple times and appearing before him to speak a few more times. Did he do anything else outside those times?
After all, he appears able to go anywhere in the galaxy instantaneously, and do anything he'd like - being that he is more powerful than any Sith can imagine - so what did he do with so much freedom and "power"?
If there's any answer to this at all, I'm interested to know the different versions in both canon and Legends.