As a freshman to join in this area, which coin is recommend to buy?
What's a "freshman" in the cryptocurrency market?
You will not lose anything if you invest in one of the coins in top 5 for a long term.
This is terrible advice. Comments like these support critics (like Warren Buffet) claims that Bitcoin is guaranteed to end badly. When you try to guarantee future gains you are foolish or trying to incite scam.
Right. The top ten coins would be your most logical choice since they're pretty established though it won't hurt if you set aside a few bucks to try your luck in icos and lesser known coins. Its a volatile market. Small coins can pump up to more than 100%. Research and study is your best tool dude
Why on earth would you recommend someone new start off with lesser known coins or an ICO?! They could lose all their money! Stop trying to promise get rich quick schemes! Investing in and ICO is the fastest way to lose your money. Most ICOs never take off and it takes weeks or months for mainstream exchanges to begin to support the ICO coin, and until that happens you're unable to sell your coins!
To the OP, start with an established coin - Bitcoin or Ethereum. Then read, learn, read, learn, and growth from there. Bitcoin is coming off a low right now so it would be a great time to buy Bitcoin on the dip.