Recently, a part of my frens asked me what level is needed to trade full-time,

I personally think it's about knowing what you are trading, knowing the maximum amount you can lose each day, and being able to stick with it for at least half a year. It's not about how much you earn, but knowing first how much you can lose each day. If you haven't violated any rules of losing money within half a year, then I think you're good. If you want my advice, start by learning defense in trading. If you want to develop, don't you have to keep yourself alive first and protect your account from being knocked down? Then, profit becomes a matter of time, and only when both profits and losses are stable can it be considered a beginner level.
The essence of the currency circle is just a game of chip exchange. The so-called logic and fundamentals are just means to deceive more relay chips, the essence is to tell a story, and then sell it to those who believe in the story. Small funds tell small stories, large funds tell big stories, some have short cycles, some have long cycles, the essence is not much different, it's just a cycle, and it's always the same. The core meaning is actually 'Who runs faster'.