State's taxes for online investment on Robinhood?

I'm confused about whether I have to file state's taxes for online stock investments on Robinhood. Which state I should file taxes for (my residential state or Robinhood's state)? I just bought and sells several stocks last year, so I know I have a net gain. 

I'm not using Turbo, but I'll use Springtax to file my taxes for this year. Appreciate your answers!