HODL
HODL is crypto slang for holding a coin through price swings instead of selling, from a misspelling of “hold” in a 2013 forum post.
It began as a typo in a Bitcoin forum thread titled "I AM HODLING" and became a motto for long-term holders. The strategy is simple: buy, ignore the price and do not sell in a fall.
Holding through a fall tests how deep it can go; see the drawdown study. The drawdown recovery calculator shows what a loss needs to be won back.