When students purchase any of your lesson packages, your potential earnings on those sales (price minus platform fee) are your Booked earnings.
Once you deliver the lessons and submit your notes, your students can review and approve them within 72 hours. Otherwise, they get marked completed automatically unless a problem is reported. The earnings from all your completed lessons are your Accrued earnings.
Each accrued earning will have a payout date. The accrued earning for which the payments have already been made are your Paid out earnings.