What should I do with $100

Hello everyone. I am completely new to investing in general, but I really like the idea of dividends and the reinvesting of dividends. I recently opened a brokerage account using Robinhood, which I played with $200. I have grown it to about $350 right now, but I want to have a real “set and forget” account using fidelity. If something about that seems off please share opinions. But when I transfer some of the money over, and eventually start depositing directly into the account, what should I actually invest in? I’ve watched some YouTube videos and have been snooping around and I keep seeing SCHD. I know dividend investing takes along time, and trust me I know $100 is not taking me far, i just want to know where to start. Thanks