My biggest mistakes:
1) I bought 1 BTC for 3000$ at June and after 1 weeks bought for it a bag of altcoins which are folling down up to November 2017, but actually I fixed profit or zero at USd, but not at BTC
2) I didn't take part at one very good bounty project, where my friend recomended me very long time. He made totally 20.000$ and I was shocked and went drink wicky.
3) NXt also bought on the high and now -90%. Such as examples a lot. Some examples very good, bought XPR for 0.3$ sold for 3$
I had a similar situation with bitcoin, I also bought bitcoin that year and then spread it over altcoins. in the end, I barely fought back to $ but to bitcoin the dep fell at times.but the worst thing I knew about Bitcoin was when it cost $ 400 but did not betray any value to this topic and just passed by. and when I got up, I tried to jump into the outgoing train