Topic — main section of the lecture (collapsible).
Subtopic — click to seek the video; notes auto-switch as the video plays.
💬 Q&A — student question answered in the lecture; click to seek and expand the summary.
1–9 switch lecture · Space/K play/pause · J/L ±10s · P pin notes
Drag the bar between the video and notes panel to resize. Your preference is saved.
Press play — the relevant lecture notes will appear here as the video advances.