2-waiking up in the middle of the night only to turn from side to side and go to sleep on but... suddenly you remembered where you left your position open ... and thats the end of sleep... you have to pick up the phone and check the price
Haha, exactly. Even the picture is suitable:

I hate leaving a trade open overnight. then I can't fall asleep for a long time, and if I wake up in the middle of the night, I immediately climb to look into my phone, how are things with the chart.

2- Ask him about his holding profit not after 15 months of bull market. Ask him about his holding profit 15 months of bear market when everything will dump 80 - 99.5%. I'm sure it will not be as spectacular.
Of course, there are moments when the investor is in a big drawdown, but if we talk about a long-term holding within 2-3 years, then the holder will be in the black. For example, a bitcoin holder.
Good thing about scalping is that its the fastest way to learn how to manage your money, how to open and close position in best possible place, how market works, how volatile it can be, how it react on news. I think that the most successful holder is ex-scalper with 2 years experience. Person that can read chart. Hodler, who never actively traded is good only during never-ending bull runs (BTC in 10 year time frame is during "never-ending bull run"). But nothing grows to the sky. One day crypto market will enter 10-20 years of bear market. Most holders will eventually break selling at the bottom. -90% from ATH. Who has such strong hands to hold an asset for 20 years losing year after year.
You're right. Scalping and reviewing charts for many hours helps a lot in the future. Skills develop, you can already predict upcoming events on the market in advance, because you look at the chart and understand that you have already seen such a development of events, and more than once. After 3-4 years of daily trading, you begin to see small patterns in the market based on your historical statistics, when you spent a lot of time at the computer. In this regard, I certainly do not regret that I spent so much time on scalping, there are positive aspects to this, of course.
From my experience - The best way to start is to daytrade for 1-2 years while learning about crypto as much as possible. Actually using it as much as possible - sending coins, using DEXes, using different chains. Trying different strategies. Allocating profits in middle term investments that might turn to be long term if project will continue to deliver promises and continue its dominance over market. In fact never puting on unconditional hodl more than 20% of wallet. More than 1-2 years of scalping is devastating for health (mental and phisical).
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I agree. But holding is the most risky strategy. for sure not for newbies.
For beginners, a long-term holding is not suitable at all, they will sell everything at the very first major correction, they simply cannot psychologically survive this phase of the market. We need to prepare for this, and short-term trading will help here, where you can get the necessary skills.