I know that there are many kinds of alternative coins existing today, but is it better to have that many coins instead of having just a few? What are the benefits and harm in having that many alternative coins?
Having few or many altcoins is not the most important thing, but that the first thing to consider is the nature of coin or coins you are holding. If what you are holding are shit coins, then you have to be careful and find away to sell them off. Then it will also be good for you to be able to do proper followup for the coins you are holding. Just hold the number you are able to manage.