Thanks for all your awnsers, this is going to help me.

But now, let's take an actual topic : cannabisdarkcoin (CND). I didn't read anything about this coin and this is only an example.
When I went on Bittrex on the 26th october a CND was worth 800 sat. One day later, it was worth 2,6k sat.
How was I supposed to guess that ? This coin has an important volume, but I don't know what that really means... Does it mean that a lot of people are trading right now because the coin is popular and consequently that the price is about to moove anyway ?

Again, on bittrex when I click on the BTC-CND order book on the top, I can see a green and a violet part, both representing sells and buys of course. How should I read this ?

My problem here is now not the way to seek informations about the coin to decide how it's going to go but the things I have to read on charts and orders books... Could you help me on this ?
Thanks for everything