At this stage, there's a fair amount of luck involved. You can research and think you know what you're getting into, but the nature of the market is to have its ups and downs. A few dollars loss isn't a bad thing. That's a storm that's easily weathered. Now, if we get closer to $100 lost without hope of at least breaking even on the investment, that's a different story, but part of playing the game.
That's where the whole "Buy low, sell high" comes in, but you can only guess/predict/research so much. What a stock will actually do depends on so many factors that can't be forecast.
What's nice about Robinhood (and I'm sure others) is that you can see how a certain stock has been trending over different periods of time. You can see the highest it's gotten and the lowest it's gone and etc.
The biggest question is whether riding out low points will pay off in the end or if a stock will TOTALLY tank and not recover. I'm fairing better with my few shares of Monster, because I bought them as they started this slow climb after having dropped in value from when Pere said he made his purchase.
Mostly, I'm just talking out of my back side, but I feel like I'm getting at least a basic grasp of this whole thing. I'm still at a point in life though where having $100 tied up in these stocks is definitely scary, but if I don't learn now, I won't be able to hopefully make some smarter investments after and actually earn something for my worry. Haha!