Andrew Huberman explains neuroplasticity as the brain's ability to change in response to experiences, highlighting its importance for learning and adapting. He notes that while the brain is highly plastic in childhood, adults require specific conditions to induce change. Key neurochemicals like epinephrine and acetylcholine are crucial for plasticity, and their release is triggered by focused attention. Huberman suggests practical methods to enhance focus, such as using visual attention to improve mental focus and employing non-sleep deep rest to consolidate learning. He emphasizes the importance of sleep in reinforcing neural changes and provides strategies to maintain alertness and attention during learning sessions.