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If you do a trading in bulk then yes it is worthy but if you do trading in a small amount then it is not that much effective because in large quantity you can make more than 100usd per day but in small you can hardly make 10 to 20 usd a day.
But higher you play for. Higher will be the risk of losing.

Yes i afraid from hackers because they can access our personal details. Hackers misuse our information and sell it to others for a good amount like a recent Ransomware attack.
Even people with small amount are still bit safer. But the people or organisations who has invested their huge capital in bitcoin need to be more alert from the hackers.

Now rice and fall in the value of a bitcoin is a normal thing. For two to three days Bitcoin value will increase and then after the value decreases. So tere is no need of panic and use this opportunity to do trading.

I think price of the other crypto currency is proportional to to the price of Bitcoin because when ever Bitcoin price increase the value of other crypto currency also increase.
Recently i bought ripple currency and put them on hold for long period.

You can only invest if you have enough time and money. You can invest from your savings i will prefer you to invest 40% of your savings in crypto currency and other 60% you can do a general savings of that

My friend introduced Bitcoin and bticointalk to me year ago and now i am the one who is marketing Bitcoin to others because Bitcoin is a world changing currency and also it is a way to earn some extra good amount of money. if Bitcoin get legalize then it will change the world.

Bitcoin is the way to earn some extra money and i will use Bitcoin untill it give me any kind of profit either the prices would be stable or not.

Yes i follow what politicians and leaders of banks says about crypto currency because political leaders and bank's leaders are the one who lead the country and if they announce some thing which is not in favour of crypto currency then we should follow those things.

well yes, bitcoin can rise up the criminality rate of a country because in cryptocurrencies. there is no way that you can track the transaction and if you do any transaction then there will be no history or record of the account to whom you have sent and this is the major reason that most of the countries are opposing bitcoin while considering this point.

yes people who are new in this crypto world need the alt coins the most as bitcoin, bitcoin gold and bitcoin cash has a very high value so the new coins in the market are good to invest. new coins not only give a hope of trading to small investors but also give the opportunity to earn day to day profit.

I think yes Bitcoin benefits early adopters because early the price of Bitcoin was started with 0.10 usd nd if someone bought the coins at that time had make a profit of 100000x in today's times .

That's not true not all alt coins are scams because if we talk about alt coin like ETH. ETH is used world wide in term of ICOs and and many of them got successful. Coins like litecoin Ethereum have more potential then bitcoin.

The only rule i follows is buy at low and sell at high.
I mostly buy the coins during night and sell them during morning. At night the price falls because many people sells their coins.
Most of the time this works to me and i manage to make 6-7 usd per day. But when this thing won't work then i stop the trading for few days and sell my all coins and then buy them back at low price.
Like recently lasy week 1 btc was of 10usd at that time i sold my bitcoins and buy today at the price of  9.3k usd

ETH has more potential as the Bitcoin has because you can see that ETH is the 2nd most popular crypto currency in the world and when it comes to the brand value ETH is used for ICOs which make it more flexible and useful as compared to bitcoin.

I don't think that Bitcoin will go low as to 3k usd because bitcoin is the one major currency of the crypto world. Change in the price of bitcoin effect other currency also and there are many investors out in the market who invested their money in bitcoin for a long period of time.
Even now the flow of crypto currency has also increased.

The only way that leads bitcoin as down to 3k is when people starts selling their bitcoins and stop buying.

If a company which is providing these ICOs have a good reputation in market then yes ICOs is right to invest because ICO you buy coins during pre sale and which is cheaply available. So you buy at low price and sell at higher price.
In ICOs the only one problem is that you can't withdraw money untill the pre sales end and if the company didn't make it to the minimum target then you might end up with a loss.

You are planning to hold coins for long period of time then i think ripple is a best coin because as it is having a good market capitalisation which is approximately of 474336xrp and this coin is also very cheap so if everything goes well then at the end of 3 years you can have a profit of more than 20 to 30 times.

As per my experience in crypto currency world i have learnt that evry alt coin price changes after change in the price of Bitcoin. So you should keep a record on that coin in which you want to invest.
Pump and dump in price is a good opportunity to earn profit. As when the price is low you can buy and when price go high you can sell and by this you can earn profit.

I think windows laptop are good because window is more compatible as compared to mac. Even most developer works on windows.
You mentioned that there are some virus and security issue. So my suggestion is to use genuine window only with genuine anti virus.
If you want to do mining then i will suggest to use Linux system