Allmost all altcoins out there are traded and paired against bitcoins. So just a few amount of them is paired with usd or other fiat currency. So when the bitcoin price is going down, people think that the coin value is going down. But they dont get it that they have to watch the satoshi price of their coin and not the usd or other fiat currency price.

The scam ICOs are even growing in numbers compared to the past years. Conducting an ICO is easier than traditional crowdfunding that's why it is a target of many scammers. I hope this will be regulated accordingly.

If you trade day today it is easy for you to keep it with exchanges. But your purpose is to hold for a mid or long term then you can keep in a wallet. By keeping a wallet is always safe and it is very difficult hack these method. But there is a chance to hack exchanges when comparing to wallets. So it is advisable to keep in wallets unless you are not doing trading always.

I think you don't only make profitable when you buy at Red market and sell when the market is green. You can buy a coin in green market and the price can rise at about 150%.

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