I do agree with how long-term investment is better for the vast majority of people, especially new ones, if you're capable enough then taking the risks of short-term investments instead would probably prove to be the best. Not to mention that long-term investments have a different type of risk compared to short-term ones, wouldn't really call it less risky but rather there's just more time for you to manage your portfolio since it's for the long term.
Both long term and short term has their own advantages and disadvantages so don't just say that one of them is only better while the other is the best. The advantage of long term investing is that it allows you to earn more profit but the disadvantage of it is that it may take a long time for the price to pump. In short term investing, there's less waiting time but there's also less potential in terms of gains.
When investing we don't just buy but it's important to pick the coins properly. We can do this by analysing. A signal is also useful as it can tell us if it's now ready to sell. Last but not the least is the chart. It gives us an overview of how the coins perform.