First of all almost all you tubers do their videos just to promote some websites so that later they can earn commissions. I am not saying all of them but the majority.
From my opinion the biggest part of day trade is about skill. You have to know which coins to choose and the right time to trade them. Of course luck is also a big part of day trading but you cannot make profit forever just with luck and eventually you will start losing money if you are fixed only on being lucky.
Holding and trading are different. There are different strategies for both of them same as the profit. I am unable to tell you what to choose it is more about what you choose to be. Do you want to spend a few hours everyday for trading and are you willing to follow a sleeping program so that you can buy/sell at the right time? Or do you want to spend a few hours to choose your coins then hold them to get your profit? It is your choice