I'm not sure if I have time to play with charts and trade a lot, like I have seen some youtubers doing.
They make you really believe that is more like a skill and if you are good at it, it works.
My friend told me that is just about how lucky you are, and not a skill.
So, should I stick with holding or playing day trade is a better option?
The price of bitcoin fluctuates when viewed from the graph. The absence of any entity that controls the rate of Bitcoin.
Bitcoin prices are determined by everyone who has Bitcoin (regardless of amount).
If you have Bitcoin right now, you're one of those people who determine the price of Bitcoin. If you suddenly sell all of your Bitcoin, then the price will move down (as the offer increases). So also if you suddenly want to buy a lot of Bitcoin, you have contributed to the amount of demand Bitcoin so that the price will move up.
Therefore bitcoin prices also differ in each crypto market.