Go Game Lesson (Beginner)

It consists of 21 units and total of 246 questions, so the beginners can practice problem solving sufficiently.
1. Liberty of Stone
2. Stone Capturing
3. Bringing Stones back to Life
4. Mutual Atari
5. Connection of Stones
6. Blocking Stones
7. Atari in 1-Line Direction
8. Atari in the Direction of Same Group
9. Double-atari
10. Illegal Point
11. Ko
12. Continuous Atari
13. Ladder
14. Net
15. Snapback
16. Capture Race
17. Dual Life
18. Territory/False Eye
19. Creating/Eliminating Two Territories
20. Neutral Point
21. Territory Calculation (counting)