In chapter 5; Riddles in the dark; bilbo finds a ring.
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The door turns visible on a specific full moon every so often. The riddle has something to do with the time the thrush cracks the snail. Bilbo hears the thrush crack the snail, and realizes that today is the day the door can be opened.
Smaug wasn't exactly hiding. He was laying in the main chambers in the heart of the mountain. Bilbo just went straight down the tunnel from the "side porch".
Bilbo said, talking to himself, "what have i got in my pocket?" (it was the Ring). Gollum thought it was a riddle and Bilbo decided to make it one. he gave Gollum three chances to guess and gollum lost after four. then gollum went "to get something" (it was the ring), and Bilbo thought he was abandoned and left with the ring on. Gollum thought Bilbo knew the way out and he wanted to follow him, realizing Bilbo had the ring. Bilbo saw Gollum racing towards the gate and followed him to safety.
Gandalf surprised Bilbo and he was foreshadowing the future
Bilbo's mother was called Belladonna.