How willing are you to potentially lose that $100? Don't trade emotionally, have a good trading strategy in place, tools (if available), have some good money management skills, and it would probably be a good idea to get some practice first. Not sure in the crypto sphere, but some stock and forex platforms have practice accounts. Also, don't be expecting to get rich quick with $100 investment. Good and experienced traders can make a living day trading & swing trading, but they usually have significant investment capital, so even small amounts of change can make a bigger difference (positive or negative). If you want to get your feet wet, and that's not your only $100 you have to pay rent, feed your family, etc, and you're not terribly attached to it, then it might be a good way to practice and get going. I have heard of auto-trading bots, which might be interesting, but be careful and always do your research first.

Hope that helps,
Sincerely,
The Cyberius team.