Suppose a person is using Robinhood app for stock trading. He puts $10000. His current portfolio value is $9500 meaning he has suffered an overall loss of $500. He did stock trading say 50 times out which in 25 he made losses and 25 he made gains. But overall he made a loss of $500.

Will he be charged taxes for doing stock trading even though he did not make any money? What are the polices about this?