Research the project, team, marketcap, current price, and future potential. I will give you three low marketcap gems right now with great projects. Elixir, Hydrogen, and Deeponion. If you want one that could rival Ethereum one day look into Ardor. Get in on any of these before they go up. Basically no way to lose because they are real project with great communities and not just shit coins out for a quick buck.