But with so many altcoins out there, how will you know that there are good? And I believed that there are no stable altcoins because they are much volatile than bitcoin. There are numerous pump and dump group that target specially a coin and even if this coin has no problem it will go the fate of others once a group has pump it up. I think the most safe strategy is just invest what you can afford, so that if something went awry, you will not be affected that much.
Just sticking with bitcoin trading definitely ensures trading safely. There are people who are making profits with altcoin trading too, but I'm sure they cannot make similar profits consistently. Moreover, altcoin trading is very much similar to gambling.