When to buy and when to sell actually seems simple, but the fact is that for trading, especially for day traders, things like this are not as simple as they say because it returns to the initial focus, as I said, there needs to be further learning and understanding if you really want to do that.
I agree, in day trading things get even more difficult to manage and micro-manage. Daily swings are unpredictable and hence I prefer to play it safer with long term trading and advice the same to newbies who are willing to play it safe as well. I do admire those who day trade and make a living out of it, but its not my thing, honestly.
I am not sure how much luck can actually help here because this ends up being a gamble everyday when it comes to day trading or short term trading. Quick decisions and a fast internet - all the more anxiety inducing. I am not sure everyone can handle that pressure.
This is what I do as well, there are people who trade within minutes and that scares me a lot. How could someone know what bitcoin price could be in a few minutes? How could that even matter? But at the end of the day, there are people who acts as if that is normal and make a lot of changes and cause a lot of trouble as well, that is usually at leverage trading.
They end doing as high as 200x what I saw at the top, that is obviously the highest available and usually it's much less, and that means if it goes up even 20-30 bucks in a few minutes, they could make so much profit, but if it goes down that much they may lose it all. So that is why there are so many people who make these mistakes and I rather just go with the long term instead.