actually there is no loss in trading unless you do one of two
1. emotion and impatience
2. scam (dev stop developing)
Hello I dont understand I bought for 4000 Eur one hour ago of Ethereum when it was going up, it stayed around the 10-20%, it started to decrease 5 minutes ago so I sold it and now cex.io just gave me 3500eur for it... wtf...

The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??
Agree with that if you dont follow this 2 i think you should quit your trading and dont trade because will only just lose your money. The most perfect ingredients in trading is patience and keep calm and if you dont have that your just wasting your time effort and money.