I think you might mean if Jem stood in Arthur "Boo" Radley's shoes. Atticus wanted Jem to understand that Boo, with his "shy ways" (this was before mental illness jargon was widely in use), would be too frightened and overwhelmed by the town's inevitable show of adulation and appreciation for his having saved Jem and for killing Bob Ewell. He wanted Jem to understand that Boo, silent, fearful, introverted, fragile, had no desire to live in the world or to socialize with others. He wanted Jem to understand that trying to force a person like that into the limelight would inadvertently be a form of torture. Boo Radley wanted to go back to his solitary life and not be burdened by the usual human connections most of us expect to enjoy.
Atticus wants Jem to understand the importance of empathy and looking at situations from another person's perspective. By standing in Bob Ewell's shoes for a minute, Atticus hopes Jem will learn compassion and develop a deeper understanding of why people behave the way they do, even if they make poor choices.
yes jem is courageous
he attacks Jem which breaks Jem's arm, then is stabbed, presumably by Jem or Boo Radley, who brings Jem back home
Dill and Jem see the shadow of Atticus Finch when Jem is on the porch of the house.
a camellia flower, like the ones of hers that Jem destroyed earlier. She did that to show Jem that she wasn't as awful of a person as Jem (and Scout) believed she was.
Jem is really Jerrica Benton, disguised by a futuristic holographic projector.
Jem Stone is 5' 4".
Jem Godfrey was born in 1971.
Jem Poster was born in 1949.
Jem Broadbridge was born in 1795.
Jem Broadbridge died in 1843.