He wrote 37 plays, tragedies, comedies, historical plays and romances, which is something between tragedy and comedy:
Tragedies: Romeo and Juliet, Hamlet, Othello, King Lear, Macbeth and plays which are something between tragedy and a historical play - Julius Caesar, Anthony and Cleopatra, Coriolanus.
Comedies: The Taming of the Shrew, A Midsummer Night's Dream, The Merchant of Venice, The Merry Wives of Windsor, As You Like It, Twelfth Night.
Romances: Pericles, The Winter's Tale, The Tempest.
Historical plays: Richard II, Richard III, Henry IV, Henry V, Henry VI.

Romeo and Juliet:
I think that this is the best known tragedy all over the world. It is about the unhappy love and death. The main character are Romeo Montague and Julie Capulet the only children of two powerful houses of Verona. These two houses hate each other. Romeo meets Juliet at the ball and fells in love with her although he knows she is Capulet. They love each other very much and ask Pastor Friar Laurence to marry them. Their love and marriage are secret. However, by unfortunate coincidence Romeo kills Tybalt, who is Juliet's cousin. Prince of Verona sends Romeo to the exile and young Juliet stayed in Verona. She was forced to marry a young nobleman called Paris. She asks Friar Laurence for help again and he gives her magic drops after which she fells asleep for several hours and looks as if she was dead. Romeo learns about Juliet's death and he doesn't know about the trick, so he boughs himself poison. He hurried to the churchyard and when he sees Juliet, he commits a suicide. Soon after Juliet wakes up and when she sees Romeo dead, she kills herself with his sword. Both Montague and Capulet Houses reconcile only after the death of their beloved children.
Hamlet:
This is also a tragedy. Hamlet is the Prince of Denmark. His mother, a Queen, is a widow and marries Hamlet's uncle Claudius. However the ghost of dead king appears and tells him, that it was the Queen and Claudius who killed him. He wants revenge. Hamlet writes a theatre play based on this story. But Claudius recognises that the play is about him and sends Hamlet to England to be killed. Later Hamlet comes back to Denmark, Claudius is alarmed and wants to destroy Hamlet. Finally Hamlet kills the whole family and he is also killed. I don't like this end because it seems to me like modern action films with rows of dead. But I love Hamlets monologue:

To be, or not to be - that is the question: -
Whether 'tis nobler in the mind to suffer
The slings and arrows of outrageous fortune,
Or to take arms against a sea of troubles,
And by opposing end them? - To die, - to sleep, -
No more; and by a sleep to say we end
The heart-ache and the thousand natural shocks
That flesh is heir to, - 'tis a consummation
Devoutly to be wish'd.