Meter, Rhythm, and Rhyming
A poet uses meter, rhythm, and rhyming in poetry. Meter is the recurring pattern of stressed and unstressed syllables in lines. The repetition of these stressed or unstressed syllables produces a musical quality, referred to as rhythm or beat. Rhythm is the sound pattern of a poem.
Poet uses rhyming words to unify ideas in the poem. Words rhyme when they sound alike, example sing, ringe. This is a perfect rhyme. However, words with stress syllable that sounds alike can also rhyme (example: years and yours. They are called slant rhymes.
Mood and Tone
We can understand poems by examining its mood and tone. Tone conveys attitude, mood, emotion, and voice.
Thus, a work can be formal or informal, sober or whimsical, assertive or pleading, straightforward or sly. You have to examine the words the poet uses to understand tone.