What happens if I miss a few days of a meditation course?

Nothing is lost. A course built around your own goal has no timetable and no expiry, so missing days does not forfeit progress or reset anything. The next session is simply the next session, waiting where you left it. In StillMind a course stays exactly as it is until you come back to it, and the session you return to still knows what came before. Consistency helps a practice deepen, and the structure is there to support that rather than to keep score.