what can you advise for newbie in cryptocurrency business for start?
If you would like relative safe and stable growth cash, go with coins in the top 30 marketcap.
These coins are place infront for reasons.
But if you are looking to multiply, you will then looking at ICO coins (Which i won't really suggest) because most people who go greed just got their money gone easily
The investment is $50, so I will suggest you to invest in top 20 altcoins in market cap. You have few options any how today and tomorrow all altcoins price will come low. So if you get a chance to buy waves at $2 you can buy it you can make a double profit within one month. Becasue this coin stable price is $5. This is just my observation. But before investing your money you can think and take suggestions from others and invest. Don't just invest based on my words.