Group 1 - The core logic of the turning K-line is that any new line segment must start from a turning K-line, indicating that price movements are continuous and interconnected [4][11] - The understanding of the types of central points is crucial, distinguishing between visible and non-visible central points based on overlapping conditions [7][8] - The relationship between central points and trading signals is emphasized, where each central point corresponds to a specific trading opportunity, particularly in bullish scenarios [11][12] Group 2 - The importance of integrating previously learned knowledge into a comprehensive understanding of line segment analysis is highlighted, rather than introducing new concepts without a solid foundation [3][5] - The necessity of confirming new market directions through significant price movements and corresponding turning K-lines is stressed, as these are essential for accurate trading decisions [11][12] - The distinction between stock trading, which focuses on stock selection, and futures trading, which emphasizes timing based on larger market structures, is noted [12]