Gloomy tax return in US

 Tax return is troublesome, whereas people cannot escape from it. I got my W-2 form that exhibit my whole salary and tax withheld. I don't understand what I am writing now, actually. Anyway, I should make it be over by the middle April. People say that I can achieve it by an online service, not need to use a postal service. I should enter the required information, and send these information to Tax Agency (?) through the network. I will try it with referring my W-2 form. I'm not confident that I can achieve them completely.