1. Choice and its consequences: The poem revolves around the speaker's decision to take the less traveled path. This choice, while seemingly insignificant at the moment, is presented as a significant turning point in the speaker's life. It highlights the idea that our choices, even seemingly small ones, shape our destinies and leave lasting impacts.
2. The allure of the unknown and regret: The speaker is drawn to the less traveled road because it holds the promise of something different, something unknown. He wonders about the path he didn't take, suggesting a tinge of regret and a lingering curiosity about what might have been. This theme explores the human tendency to both yearn for the unknown and simultaneously worry about the missed opportunities.
While other themes such as individuality and self-reliance can be interpreted from the poem, these two - choice and consequence, and the allure of the unknown - are the most prominent and directly related to the poem's central narrative.