top crypto coins are good for both trading and investing ,but investing in top crypto coins you will need capital more, if you can search good altcoins projects which are developing and working on there product that would be good investment
as for trading many coins will be ok as you don't hold positions for longer time
Isnt it better to invest all your money in few best coins that to do so with so many coins with low prospect of growth? Bitcoin and ETH gives you great outputs in the market these days. Many other Altcoins are also good for speculation. DO not fear the high cost of investment. You can have ETH at around $174 right now and trust me it is going to rise in days to come.
That is not good to invest all his money to the best coins because at least, he needs to survive in every day and he cannot survive if he uses all his money to invest in cryptocurrency. Maybe he needs to divide his money into two parts, one part for his daily needs and the other parts to invest in cryptocurrency. And in the parts for cryptocurrency, he can divide again for investing in many coins so he can have a chance to take more profit from the various coin.