I will suggest that Ethereum would be the best choice. Ethereum is the most popular cryptocurrency at present after bitcoins. Also with a market capital of 40 billion dollars it has one of the strongest development teams. Being one if the most popular cryptocoins available in the market right now, there are good chances that Ethereum will be $500 by the begining of 2018. It already has proven a track record of tested technical ability to handle programmatic crisis mid flight.
Yes, but you most know that all coins are unstable. It can rise very high like bitcoin was 4900 dollars worth a month ago now it was nearly 6100 dollars. You can see the difference.
I think this is possible because of that all coins are unstable. It can rise and fall up hard. You never know when.
I'm not an expert at all. I guess the best way to make money from altcoin is to buy low and hold. There are plenty of other high potential altcoins but many of them are already valued really high. Cryptos are high risk and highly volatile. Always invest what you can afford.Don't put your livelihood at stake as you may lose everything.