This simple trick I learnt - Easy investment 4 dummies (like me)-

                    

When you got NO CLUE about what is happening around but got some savings to invest, please read this short post:

The biggest cryptoexchange  is right now Bitfinex, definitely not due to the variety of coins it offers, but due to quality and possibility to do MARGIN TRADING. If not aware of margin trading, click on it to read about it.

To be able to offer this type of trading, Bitfinex has to be 100% sure that the cryptocurrencies in its exchange are solid, stable, with a good project, team, low premining and really promising.

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Summary: BITFINEX IS DOING THE JOB

They are not going to allow low-profile-scammy coins into their ecosystem.
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If a new coin is added to their ecosystem, expect it to BOOM sooner or later. From this, the strategy:

IF BITFINEX ADDS A NEW COIN, BUY!

Recent examples

Status (+70% in 48hs)

IOTA (+60% in 36 hours)

YOYOW, Golem, DATA (Streamr) same path

Quoting from Bitfinex.com

Several factors go into our decision-making process when considering adding a new token to Bitfinex. Some of these factors include user requests, shareholder interest, market capitalization, token design parameters, and a thorough assessment of the token's development process; including, but not limited to, the team behind the coin and their strategies for solving technical and nontechnical problems.We continue to monitor these factors and make prudent decisions to keep our customers' best interests in mind.