I would highly recommend avoiding alt-coins. And it would not spread the risk to buy multiple alts since they are all based on the same technology. Want to diversify? Buy some bitcoin, gold, real estate, stocks, etc.
Yes. I second that. You don't need to put all of the money into crypto. But if you feel that you absolutely must, you should keep it all in bitcoin. And if you feel that you absolutely must, you shouldn't put more than 10% of that into altcoins, preferably the top 10. But even that is pushing your luck because they have a lot of vulnerabilities.
Crypto is not the only solution for investments. Other more conventional forms have their merits as well. Nothing wrong with branching out a bit.
Great advice. I'm into the gold, real estate and silver game already. I have diversified my Bitcoin into Altcoins since we dipped under 200 billion. I know this is possibly foolish and risky but you gotta take your shot at some point.