When reading a poem closely to interpret its meaning and nuances, the title of the poem can give you clues about the theme of the poem (can reveal a lot about the poem). To interpret the meaning and nuances of the poem, you have to decipher the words in order to understand it (directly/indirectly). The title of the poem might be the most important word choice of all because it's the first thing the reader sees. The title might not make much sense until you start to understand the poem (gives us a reasonable hint about what the poem means).
