advice for you from me, but this is my personal opinion :
1. Don't buy altcoins with small volumes, because to sell them later in the future is very difficult.
2. invest in the top 100 altcoins (the biggest top 300), because it's safer and the price will definitely increase in the future.
3. don't sell your altcoin when the price goes down (panic sell) because it will make you regret when the price goes up, so you better hold it (because I'm sure the price will increase).