wich altcoin ? because he have hundreds of them and I have my doubts to with some of them and I recently read a good article about why altcoins must die in order for bitcoin to grow again and was quite interesting as some altcoins are overvalued...
I beg your pardon, so you're saying now that some altcoins died because they hand over so bitcoin will grow? Just so you know, some altcoin will tend to die as no one is using it nor have interest on it, therefore no demand with over supply will eventually kill any other altcoin.
From the word
alternative means an option or choice. Perhaps you can easily tell what's its initial difference between each other.
Likewise, as mentioned by some reading, reading, reading and reading is the only thing that can help you.