The article recommends only trading after hours with a limit. Edit: Sorry, I saw that in the help center, https://support.robinhood.com/hc/en-us/articles/21468

The article recommends only trading after hours with a limit. Edit: Sorry, I saw that in the help center, https://support.robinhood.com/hc/en-us/articles/214681903-Extended-Trading-Hours https://support.robinhood.com/hc/en-us/articles/214681903-Ex..., "That means your execution price can vary more than during core market hours, so we suggest using limit prices".