According to the enotes study guide on Austen's Pride and Prejudice, numerous themes are revealed in the novel:
- Prejudice and Tolerance
- Change and Transformation
- Wealth and Class
- Rights, Status, and Education of Women
- Personal Autonomy
- Irony and Satire (used by the characters as well as in the novel as a whole)
A detailed note is easy. Pick one and find evidence that it is revealed in the novel.
If you choose prejudice, for instance, simply find examples of people being prejudiced. Look for reverse prejudice, too: those of a lower economic class for instance, prejudging someone from a higher economic class.
Then figure out how the theme you choose contributes to the work as a whole. How does it contribute to the conflict, structure, unity, etc.?
In the novel Pride and Prejudice certainly Love versus Convenience has to be the primary theme: The two battle each other all through the novel and are each other's counterparts. Fortunately in this novel specifically love ends up reigning supreme, not without the underlyin fact that Lizzie did end up marrying an upperclassman, and with this, she also made her mother's insane obsession dreams come true.
Love versus convenience dismount each other's strenghts. Love reigns supreme while the proprieties and insane impositions of society continue try to battle it out. The women, hungry for love and affection, have to conceive the possibility of not acknowledging their needs because of the preocupations with rank, money, and climbing the social ladder to better the family name.
The courtship of Darcy and Lizzie is definitely the central action, and all the activity surrounding them bring out these very two themes. Charlotte's marriage to Collins for convenience versus Janes' marriage to Bingley for love; Mrs. Bennet's obsession to marry her daughters for convenience versus Lydia's eloping with Wickham, either for love or lust.
A lot of the forces of love versus convenience clash consistently throughout the novel, but thankfully love ends up being the most powerful force of it all.