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 ??
I think that in order for you to successfully trade, before you trade you need to have a specific plan as well as to come up with possible cases in order to be able to respond in a timely manner, avoiding losses and losses. not worth it. Planning and planning is essential to your success in business.