2020 December 30
In this website for each matter, the author's level of knowledge,
understanding or experience is defined as followings.
All rights reserved.
|Level 1: The author does not know or care that matter.
|Level 2: The author cares that matter.
|Level 3: The author knows, understands or has
experienced that matter.
|Level 4: The author knows well, understands
well or has much experienced that matter.
|Level 5: The author is one of the best
persons in the world who know that matter.