Why did Harry Potter and Ron Weasley become friends with Hermione Granger?

Answer 1

Ron and Harry "saved" Hermione from a troll. She wouldn't have been in a situation to be endangered if it weren't for them so they ran to help. The boys are awarded house points and Hermione loses some because she covers for the boys so they don't get in trouble.

Answer 2

She realizes she starts to have feelings for Ron, and that definitely changes her relationship with him. This happens perhaps over the summer, and really shows itself at the Yule Ball. In my opinion, over the summer she perhaps misses him, and when she saw him when she came back to the Burrow, maybe she saw him in a different light.

Also, character-wise, she is also becoming more confident in herself. GOF is the first book where you see a definite change in her personality, from the first three books where she's hiding behind her schoolwork, to the later three, where she's more herself and takes charge with more confidence, not in a bossy insecure way. That is actually because of her spending so much time with Harry and Ron.

Mainly though, it's just her liking Ron.

Answer 3

Harry Potter and Ron Weasley saved Hermione Granger from a mountain troll. Hermione then lied to Professor McGonagall to get Harry and Ron out of trouble. After that the three became friends as the boys realised Hermione wasn't that bad and she began to be a little more relaxed on breaking the rules.

Answer 4

Harry and Ron felt bad that Hermione had heard them saying mean things about her. she was crying in the toilets when the troll got released into the castle so Harry and Ron went to warn her about the troll but ended up saving her from it after they had locked it in the bathroom with her.
after that they were friends.

Answer 5

The friendship between Harry and Hermione did not come into existence immediately in the same way that Harry and Ron's friendship began moments after they first met. Their first encounter was on the Hogwarts Express (to the castle) in their first year. Harry and Ron thought she was pretentious and at best Hermione considered the two of them affable (at worst she thought they were idiots).

Either Hermione valued Ron's opinion or had really low self-esteem in her first months (which is magically overcome by year's end), because she cried her eyes out after he made some disparaging remarks about her and she overheard. This led to the confrontation with the Troll in the Girl's Bathroom, wherein she did the first openly friendly thing: lying to a professor to prevent Harry and Ron from getting in trouble for trying to save her.

They start to become genuine friends by the time of the Quidditch match by which point Harry is on his quest to prove Snape's maleficence. Hermione joins somewhat begrudgingly and this quest really cements their friendship as it uses Hermione's intuition and Harry's incessant need for more information/control.