Just started trading yesterday. Was up 5% yesterday down 12% so far this morning, why and what should I do?

I have coca cola, adobe, footlocker, roku and znga (free stock robinhood gave me). Sold two penny stocks last night and decided to spend it on roku so I have mostly big name stocks

Submitted December 27, 2018 at 10:41AM by iamnotacrustycrab http://bit.ly/2EOtTQE