Well, never put your eggs in a single basket is always the idea. And it's generally a good idea to trade large market cap coins if you're unfamiliar with the mechanisms of trading. They tend to fluctuate within a range. Try to look at charts and identify a low buying point for you. It's important that you can apply the dollar-averaging technique here. So say, if the price of the coin drops, you can increase your position and wait for the price to rise again. Of course, this comes at a risk as well, so it's important that you follow the charts and news closely if you want to be successful in trading. Best of luck.