Mistake #1:
Never engage in medium or long-term trades with shitcoins.
These highly volatile assets can be removed from exchanges at any moment, dropping sharply—sometimes by as much as -50%! They’re unpredictable, defy technical analysis, and swing wildly up and down.
Shitcoins are strictly for scalping or short-term trading, and using a stop-loss is absolutely essential.
Mistake #2:
Avoid overtrading at all costs.
Just because you’ve exited a trade—whether it was profitable or not—doesn’t mean you should immediately jump into another one. Sometimes not trading at all is a win in itself.
Excessive trading increases your chances of losses and drains your focus and patience.
Mistake #3:
Don’t buy newly-listed coins on exchanges, especially if you’re a beginner.
You’re at risk of becoming liquidity for early investors or teams dumping their tokens on you. This has happened many times with freshly-listed coins—beware of the hype!
that's my 3 mistakes , What's yours ?
It's very tempting to hold a position in an Altcoin for a very long time if the price of the Altcoin is not going in the expected direction after the position has been opened, this happens with Altcoins where it is believed that it has a lot of good potentials, but unfortunately, just as you have said, decision to hold such Altcoins most of the time ends to be a big mistake, and some time, the Altcoin will start going the expected direction direction immediately the trader has closed his position and taken the loss.
It's a very good advise to trade Altcoins, most especially the not so popular ones, on short terms only.