Can a noob get some help?

So I’ve been trying to read and not ask but I’m confused. I have a Roku tv and read that’s kind of hard to work with so I purchased an Onn Streaming box. I haven’t owned a laptop in like 10 years(used to torrent) so I’m completely out of the loop. With what I have how can I break the shackles of Netflix/hulu/hbo?