The Three Caskets:

The competition for Portia's hand, in which prospective husbands from other nations select between gold, silver, and lead caskets, is comparable to Venice's social structure and judicial system. 

Christian doctrines are combined in the casket competition, including the notions that human desire is a poor guide and that people do not deserve God's grace. The lead coffin, which held Portia's portrait, served as a reminder that finding true love is not easy. To find love, one must put everything on the line. Bassanio married Portia and went with the lead coffin.

Christianity teaches that individuals should not believe the information presented by their senses since appearances can frequently be deceptive. Bassanio enjoys the competition even though he is aware that his good fortune is unmerited and despite this, he is willing to gamble all.

The Pound of Flesh:

The pound of flesh Shylock demands can be interpreted in several ways, including as metaphors for two of the play's most important relationships and for Shylock's rigid commitment to the law. 

The fact that Antonio's flesh must be used to pay Bassanio's debt emphasizes their relationship and the rigidity of Shylock's world. 

Leah's Ring:

Another significant aspect is the ring that Leah, most likely Shylock's wife and Jessica's mother, gave him while he was single. Shylock laments the loss of the ring after Jessica steals it and exchanges it for a monkey, demonstrating his gullibility and empathy. 

The ring is a significant representation of Shylock's capacity for both love and grief.