The Question and Answer section for The Republic is a great resource to ask questions, find answers, and discuss the novel.
Describe a “cave” in modern life in which people are “imprisoned”.
Socrates believed that justice is about unity and order to overcome external distractors. Socrates maintained that people must “know thyself" in order to internalize a sense of justice within themselves.
There are many points that Plato makes that are central to his phelosophy. This really depends which area you are interested in. One of his central tenants was his belief in the immortality of the soul: several dialogues end with long speeches...