When Peeta was swinging a knife around cutting down plants, he accidentally hit a force field that shocked him so bad that his heart stopped. Finnick performed CPR on Peeta which saved his life. He could have just left Peeta to die, but he didn't.
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Katniss chooses Peeta instead of Gale, because Gale holds to much rage and Katniss has her own to deal with anyway. Peeta on the other hand does not hold rage at all. Plus they have been threw so much together, so why wouldn't she pick Peeta?
She bonded with Effie in the first book and they became closer together
Peeta
Well it's a match to the death so you would try not like any one. Because you would have to kill them. And Clove had a good chance of winning so wen she sall that Katniss was good she did not like her. Also Clove is just a bitter person. That the only things I can think of.
Thresh, the District 11 boy tribute. He saves Katniss because Katniss was helping Rue (his district partner who had died by then via Marvel from District 1), however, Thresh mistakenly thought it was Clove who killed Rue. He, like Katniss did not like to owe someone anything, and liked to clear any debts away as soon as he could.