I don't know the episode per se but I know it's the rescue Matsuri-arc, in the fillers. Around episode 118, or maybe it is episode 118. I don't know.
The episode you are referring to is "Naruto Shippuden" Episode 32, titled "Return of the Kazekage." In this episode, Sakura and Gaara are discussing the Sand Village's future and Gaara shows her a room with books that he has been reading.
well none
No, Naruto is friends with Gaara but has a crush on Sakura.
I believe the one you're referring to is Naruto Episode 58 Hospital Besieged: The Evil Hand Revealed!
She doesn't. She finds out about Naruto and the Kyuubi when Naruto tells her during the Save Gaara Arc of the Anime/Manga.
Naruto Episode 80
Gaara doesn't know that Naruto is a Jinchuuriki yet. He only knows that Naruto has compassion for him and who he is. All other characters know he is a Jinchuuriki. We all anticipate the manga/anime that Gaara finds out Naruto is a fellow Jinchuuriki. Then and only then will Gaara see why Naruto cared so much for him, despite being from formal rivally villages.
Sakura and Gaara never hugged or kissed in Naruto. Naruto is a manga series that debuted in 1997 and is an ongoing series.
Naruto episode 216
in Naruto Shippuden Gaara is the same age as Naruto, Sasuke, And Sakura which means that Garra is about 15 in the beginning of naruto Shippuden, and 16 in the most recent shippuden episodes...
In none, it never happens.
They are friends but not very close ones.