Did you buy and sell stock? How did you do it? If you are capable of buying and selling stock , by now you should have figure it out it's impact on income tax. Here is the link. https://www.irs.gov/instructio...

Just started via Robinhood

You can directly import tax document(capital gain loss/dividend) in turbotax from the major brokerage accounts including Robinhood.

There are two types of taxes on gains.. Long Term, which is for stock held for more than a year, and Short term is shorter than that.. The Long term are not taxed or taxed 15% depending on your income. Short Term are taxed as just your regular income. However Loss offsets the Gain which is a good thing here in US.