The most expensive mistake I made in crypto wasn't buying the wrong coin. It was being right, then getting greedy. I entered a trade with a solid thesis. Price moved in my favor, so I increased my size. When it reversed, I moved my stop, averaged down, and told myself I could make it back. A manageable loss turned into an 80% drawdown. That changed how I trade. Now I decide the invalidation point before entry and size the position so a stopped trade costs about 1% of my trading capital. Risking one percent means ten losing trades are painful, but still survivable. I take partial profits on the way up, and I keep long term holdings completely separate from active trading money. The math is brutal: an 80% loss needs a 400% gain just to recover. You do not need to predict every move. You need to stay solvent long enough for the next one. For beginners, start with spot BTC or ETH, use little or no leverage, journal every trade, and never add to a loser just to protect your ego. Missing a pump feels painful. Losing your account is worse. 😅