The best lesson I learnt and which everyone else should is to always keep your investments reasonable,and when i mean reasonable I mean at a level you know deep down you really can afford to lose.
Most people take loans,borrow money just to invest in here, it's a foolish step and one that can backfire will a whole lot of force, always invest with your own money and with a bearable amount
The crypto market teaches about chasing profit, where there is no limit to when to sell or when to buy. Everything takes place naturally, only based on feeling and uncertain calculations, because the crypto price is no parameter that becomes a benchmark.
But the crypto price is very attractive to investors, the profits can be very large in only a short time (such as 2017), the most important is controlling patience to wait until the price rises.