I know that trading requires knowledge, but any tricks for newbies about when to buy or sell? For example, looking at the volume, looking at the queue for buying and selling and etc.
I think best time to sell is when you make x2, the second best time to sell would be when you made x10. I know that sounds like a big difference, and when we are talking about bitcoin that is actually a big difference, but when we are talking about other coins it is not really that much.
Something can go from 20 million dollars market cap to 40 million and eventually to 200 million, it is quite possible and has happened multiple times so far. Bitcoin going from 16k ranges to 32k ranges and then to 160k ranges eventually is not unlikely neither, so from the bottom to top it could still happen, not for a while longer but it could possibly happen eventually.
You have a similar thinking to my own, if you invest in an altcoin and the altcoin suddenly grows 100% then you can sell half of your coins and recover all the money you invested in that coin, this means that from that moment on you are playing with free money, and even if the altcoin went down all the way to zero you will not lose any money at all, so you can take a higher risk and keep holding your coins even when there is a sharp decrease on the price of that coin as you know you have nothing to lose, and sometimes this is exactly what you need as then the coin pumps and you can multiply your money many times over.