Hi, Can you please tell me the which type of altcoins we should buy. Like:- which has already product established or having a strong development or backed by someone very powerful(big companies) or whose idea is best or any other reason which we should consider while buying the coin?
Nothing can substitute your own research and also be aware that most of the ICOs are launched by startups and sometimes they don´t even pass the most basic common sense test.
Having said that, at the moment you may want to consider Sether, Ink and goNetwork for your research.