Most of the people here will say patience, discipline etc. well for me it's just the common things to learn here and that's the first thing a person will learn but for me the best thing I learned in the cryptos are the following.
HODL didn't work most of the time, in some cases it's better to sell the tokens/cryptos you have rather than hold it for a long time
Down market is not always bad, sometimes it's an opportunity to make an investment
Learn how to cut loses and accept the fact that you lose
Trading is a complicated thing
There's no such thing as exact strategy that will work in trading cryptos
Reading the candlestick gives me head ache
Well here are just some of the things I've learned in the cryptomarket