As a beginner, my simple advice for you is to simply invest in the most reliable coins. I will advice Bitcoin mostly because that seems like the most reliable at the moment, to a lesser extent, Ethereum and XRP. The first thing is to try buying when you believe the price is at a relatively low point. At this point, you will just have to wait to see how market conditions improve over time. If you are willing to take greater risks, you can go for coins with lesser volumes because they tend to produce more profit in the long run. I do wish you good luck in your endeavors.