It depends on the context and the specific request.
* If you're asked explicitly about the structure of a poem, then focusing on structure is the most important thing. You might discuss:
* Form: Is it a sonnet, haiku, free verse, etc.?
* Meter: Does it have a regular rhythm, or is it irregular?
* Rhyme Scheme: Does it rhyme, and if so, how?
* Stanza Structure: How many lines are in each stanza, and how do the stanzas relate?
* Line Length: Are the lines consistently long or short, or is there variation?
* If the request is more open-ended ("Tell me about this poem"), then you might also discuss the content and meaning, alongside structure.
Ultimately, it's about understanding the request. If you're unsure, it's always best to ask for clarification: "Would you like me to focus on the structure of the poem, or discuss its meaning as well?"