Tris' main conflict is the factions she has to choose which one she wants to stay in and shes having a rough time deciding between dauntless and abnegation, where she is from.
Rising action 1
When its finally Tris' turn to decide she doesn't know what to do because seconds ago her brother switched from abnegation to erudite so she starts going crazy in her head debating on which one she doesn want to choose.
Rising action 2
When Four finds out that Tris is divergent he freaks out because he doesn't want her to get caught otherwise they'll kill her.
The climax is when the erudite and the dauntless declare war on the abnegation and all of the dauntless become mindless war machines except for Tris and Four because they're both divergent
Tris and Four end up getting caught and held captive at and Erudite facility, Four gets brainwashed and Tris brings him back to reality and they turn off all the mind control computers
Tris and Four run off after shooting Erik in the foot after he threatened to kill four because of all the hate Erik has for Four Tris finds her mom and she also finally finds out that her mom was a dauntless solider before she became abnegation.