The 16-character guideline for trading and investing in Bitcoin:
Adhere to fixed investment: invest once on the 20th of each month, and practice for ten years.
Add positions when the market falls, and stop profit appropriately: for swing positions, follow the 4-hour cycle, and increase or decrease positions on the 2b structure, support level, and resistance level.
Never short positions: put the bottom position of Bitcoin in a cold wallet, and don't change it. Let's see whether to sell it after ten years.