First you have to know where you want to invest it. You can invest it full time on one coin. For example you can invest it on bitcoin. You can buy bitcoin. It is good now to buy bitcoin as its price is the lowest. You can hold it for how many months. It can be the greatest pump when time goes by. And when that time comes, you can gain a lot of profit. Or you can invest that portion per portion. For example half of it invest it to bitcoin then the other half invest it in ethereum. You can also do trading. Buy an altcoin you know that it will be profitable then exchange/trade it when that time comes.
I don't know if daytrading is a good option for anyone starting, especially with $50.
You can try instead investing some steady rising coin and wait for a few months to get an ok profit. Then you can diversify accordingly.