The worst thing I ever did was sell my bitcoin at a very cheap price I had a huge loss. My mental and emotional level is an important part of taking every decision.

When I started trading, I tried to do it on 5 and 15 minute candlesticks on the chart.
Tried to catch the top and bottom, resulting in losses

When I see to it that most of the time when everyone has the knowledge in trading, you keep in trusting him and give your ETH and Private Key to hold the wallet. I was being fooled already and it seems that the coins are in the wallet already.  It is a biggest decision that I've ever made and the biggest lesson that I've ever learned.

The fact is that in most cases, the forecasts for Bitcoin broke, and the etherium was almost always avoided. But nevertheless for today we see real prospects of the etherium about the future. I think this is a better investment than Bitcoin.

It is the psychology but more importantly it is the emotions that get the best of us. This happens in every facet of life and trading is no different. When we lose we want to get out to stop the pain and when we win we want to book our profits. You must get a better mental state if wanting to achieve big things at trading cryptos imo!

as a newb I once bagholded and got f_cked. Damn, I remeber very well. Never had so much stress in my life.

Every trader should have a strategy and stick to it, rather than panic. However, sometimes, I would not consider somethings as panic; I would rather call it playing safe. The same BCH has reached my stop loss before, sold it and all of a sudden it started rising back, of course some would want to quickly buy back into it and then all of a sudden it came all the way back down before you know it. That is one controlled market I have told myself never to trade again. So, at the end, it is just what they call moving on, and better safe than sorry.

Those are probably nothing more than pump and dump groups but people should know better if I knew what a coin will do before it happened I will not share that information with anyone I will probably bet the farm in that trade and become incredible wealthy overnight so it is obvious most signals groups have to be a scam, there is no other way around it.

That is one thing almost everyone has obviously been a victim of and there is nothing we can all do about it. If the market decides to keep moving up and you take out your profit or you miss out of the show in the dying minute, it is just to accept your fate and move on. This is why some traders always prefer the long holding than having to do short term trading. Everyone have their own preference, it is just for you to make the best use of it.

Exiting ETH at $300 thinking that was the peak, after buying in at $120.

Well, that is if the OP is talking about signals gotten from indicators, Technical analysis and Fundamental analysis.

In this case, I am sure the OP is referring to Telegram signals where someone calls the shot and the followers do the usual thing which is to follow blindly. That is a huge problem for someone who wants to trade, because there is no way they cannot end up losing a lot at the end. It is always good to have the knowledge and be able to make decision without being told what to do.

My worst trade decision was a few months ago. I bought all my investment in BCH and inmediately the market started to decrease. Panic seized me so I decided to sell all.
The next day the market started again to raise.

When I sell all my bitcoins (120 pieces) for 1000$ a couple years ago)) In that moment I didnt believe in bitcoin and now I feel myself very foolish((

I spent all money I had to bought some small percentages of BTC, XLM, XRP, ETH, and NXT at the price around USD 12,5k at the time, upon suggestions of my friends who was get in cryptocurrency earlier. They assumed that btc cs would never fell beneath USD 11k. As a newbie, I followed their suggestions. Since then the prices were fell deeper and deeper. If only I knew that the price will be around at the price on recent days, I won't b rushed to spent all my money to bought them, so I could do better investment nowadays where the prices are more sexy. 
I learn lot things since then. And those things lead me here, to learn and study from true masters of cryptocurrencies. Respect!

When I first stepped into this market I encountered many failures, but the most painful failure of me when trading was that I lost 98% of my property in one night, and also because of lack Puzzled experience that was FOMO. I invest in BCC when its price is at $ 363 but I do not sell gas it is declining value and currently it only costs $ 3. That is my lesson as well as my biggest stumble.

My worst decision in trading was also connected with selling of all alts I had when they started to fall. Then the pump followed and I understood my mistake.

Sometimes i feel the same too. When some of my ico coins that i bought suddenly deep. There is always a feeling that i need to buy more because it's too cheap but i'm also afraid that it will not increase in it's price. Now, when i believe in the project i will buy more at low price. We can't win or profit if we are afraid that our money will be gone.

The worst decision in trading that i have ever made is selling most of the cryptocurrencies that i hold in this kind of scenario. I am talking about the massive correction and dumps of the market that made me shake my hands and just sell my cryptocurrencies but this time, i know that i just need to hold and keep my faith on my cryptocurrency holdings.

I think my worst trading decision is when i sell my appcoins in such a low price. I sell it at $1.5 and after one day the value of appcoins became $4.2. I did not wait for the price to go up before i sell it.

I heard people on this forum said that nxt will be very potiental and it gonna give me another free coin when i hold nxt . I followed them and suddenly NXT drop 50% price. It's really sucks.