Common mistakes of those newbies in trading are being hyped and excited about the profit they are seeing when they see advertising or influencers that are flexing their earnings from trading. They think it is easy as that without knowing that those influencers or ads don't show the hardship or grey part of trading.
For me, it's okay to treat it as a motivation for you to actually learn more about trading. But if you are still newbie and please know your place, it takes a lot of time to actually get to that point and by only motivation won't get you anywhere, trading is not easy even if you know what to do due to how trading works and how easy it is to get manipulated.
There are many posts or topics about advice or reminding new traders of what they should do and not do, but it will not be effective if they don't read those topics. How about those traders who are not familiar with this forum? How can we reach them about this kind of topic so that they can avoid what they are doing wrong in trading?
Doesn't really matter. Most of the newbies thread here about trading they just don't seem really care after they made the threads, they just throw away the thread and never come back.
That depends on the users itself, if they want to learn there are lot of place to learn about trading and if they care about it in the first place, they will engage about the topic instead of just dip out instantly.