As a newbie, try to keep track of how long and how much you have actually researched your coins. Think of how much money you intend to make with them in the long run. Use these two bases as a compass to guide you.
I.e.: Esp as a newbie, it's pretty unrealistic to be invested in like 5 coins, because it's unlikely you understand more than the basic concept behind each coin. This can lead you to sell at even the smallest dips because you lack conviction. Or even worse, you might allow a project to take you down -80% because you ignored the warning signs and you really didn't do the research needed to prevent yourself from becoming a bagholder.
As a newbie, just take 3 main coins. Learn every little thing about them till you can recite them to your friends and family, as well as take part in serious discussion about each one. After you can do that, then feel free to branch out.