The correct answer to this open question is the following.
Although there are no options attached we can say the following.
What we have learned from Magellan voyage around the world is that Ferdinand Magellan was a Portuguese sailor that sailed the seas in many occasions and discovered important geographical features such as the Magellan Strait, the passage to the Pacific Ocean from the Atlantic, at the bottom of South America. Indeed, he was the first navigator to cross the Pacific Ocean.
During his explorations, he also discovered a route to the Spice Islands.
So we can conclude that Magellan's explorations added new knowledge about planet Earth in that he demonstrated that sailors could navigate the entire globe and that the planet was different than what Mediaeval times people thought.