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Why did I lose 2 cents more than the difference in the stock prices on my Robinhood trade?
Free, huh? From their Commission and Fee Schedule:  So if you literally bought two shares, then the SEC added one penny in fees and FINRA added one penny as a "Trading Activity Fee" Note that there are several other fees on their schedule that may not apply to you. If you had bought 100 shares instead, your total fees would have still been only 2 cents, but you would have lost $4 on the trade.  So the fees are minuscule when you start doing larger orders.   However, That should not discourage you from experimenting and learning.  I'd rather pay 2 cents in fees on a 4 cent loss than 2 cents in fees on a $400 loss.  Just chalk it up to the cost of experience.