What is Shakespeare's theme about young love?

Opinions vary concerning what Shakespeare is revealing about young love in Romeo and Juliet. 

First, you can interpret the play by viewing Romeo and Juliet's passion as leading them quickly into catastrophe.  Their impetuosity knows no limits, and leads to their destruction.  Shakespeare takes great pains to compress the action into a mere five days.  Their love is reckless and destructive.

Some, however, think Shakespeare is representing the tradition of courtly love with Romeo and Juliet.  They meet, fall immediately in love, battle obstacles, and vow to love unto death, which they do.  One aspect of courtly love the two definitely exhibit is their reverence for love itself.  It carries more importance than all else.   

These are just two of the ideas Shakespeare may reveal in his play.  I'll let another editor handle some others.