trader doesn't have portfolio because they trade, they don't hold for long, investor on the other hand build portfolio, you won't do good having advice from trader either, since they usually trade on lower timeframe, while investing sometime mean yearly holding.
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probably the only advice that's good is to buy when RSI shows oversold and price already gone too low.
I don't believe that ALL traders don't have any portfolio at all. What I believe is that they have funds intended for trading, and they also have funds for holding as well. I also trade (not an expert though), but I still hold some coins just for capital appreciation because I don't want to risk all of my money into trading since we know how risky it is. As for the RSI thing, thanks for sharing as well as it would help newbies like us in our trading journey.

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Investment planning is another advice they seek, they would want to make wise investments decisions, how they should diversify their investments, how much they should allocate to each portfolio. As an experienced crypto trader, what advice would you give them? What is the best way to go about investments ?
Investing and trading are 2 different things like what the above posts said, and I don't also think that I'm in a position where I need to give some advice to these traders about investing because as much as I believe that traders doesn't have any investment portfolio that they're holding in long term, I still believe there are some who has just for safety purposes if things go south.
I also believe that these traders know how to make better decisions when it comes to investing.