SCARLET LETTER help CH2-3?

Question

what sin did that girl commit.. HESTER PRYNNE
and whats important that i should know?

i really dunt care about getting the story ruined for me or anything so tell on..

Answer 1

She commited the sin of ADULTERY (sex outside of marriage). She was therefore sentenced to wear a red letter "A" for ADULTRESS. Thus the title of the novel ... scarlet (red) letter