A pump is a fast run up, often on hype. A dump is a fast drop, often when large holders (whales) take profit into that hype. Learning to tell buying strength from a blow-off top is the game.
A huge green candle on massive volume near the top is often distribution: big holders selling to latecomers. A capitulation wick down can be the opposite: panic selling that smart money buys.
Key takeaway
Chasing green candles is how most people lose. The move you see already happened.
Tip. When it feels euphoric and everyone is certain, that is usually late, not early.