i really don't understand how the price increase or decrease?i saw that price coin changes randomly.If anyone help to know trading,I will be very grateful.
That's one of the benefits of using bitcoin, the price cannot be predicted.
That is not really a benefit and neither is it a disadvantage. That is something that is just normal. There is a lot of uncertainty in the market but when the market is normal not like what we are having now with everything going red, then you can at least make some predictions based on what you can expect from the market, but sometimes, it may not work out, and that is the reason for the stop loss.
only your luck can help you out to make a profit in cryptocurrencies. predicting up and down is not possible.
Luck is not needed when you are trading cryptocurrency. Your knowledge, idea, and how to play safe in the market is all that you need. If you do not have those and you are capitalizing on your luck, then bro, you are gambling, you are not trading. So many people do this all the time and they really do mess up their funds rather than just holding it.