It was more chakra for him to use in the future.
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He handed it out before he died
You have to do the jutsu quests
It is unknown which powers Itachi gave Naruto. It might be revealed soon as the long-awaited battle Naruto vs Sasuke is about to begin. what itachi gives naruto is uchiha shisui 's eye. shishui 's eye is very powerfull and it can control a person without him knowing he is being controlled. he was a gifted uchiha.danzo has his right eye and naruto his left. itachi puts acrow inside naruto,that crow has the sharingan of shisui. that crow will come out if someone activate amaterasu or tskuyomi which itachi feels will save naruto from sasuke's sharingan 's power. That power is called koto amatsukami.
Yes, as a member of the Uchicha clan, it's very common to know the Fireball Jutsu.
Itachi did not give his powers to Naruto. Instead, he gave a crow with a Sharingan implanted in one of its eyes to Naruto. That Sharingan was Shisui's Sharingan which had the ability to brainwash anybody if used in the Mangekyo state.